Quick Reference
| What | When | Key Numbers |
|---|
| Henry's Fork | June 15 - Nov (Ranch opens June 15) | ~762 CFS Island Park; ~1,012 CFS Box Canyon |
| South Fork Snake | Year-round (terrestrials Aug-Sept) | ~10,250 CFS; 5,000+ trout/mile |
| Teton River | Memorial Day - Nov 30 | Low and gin clear; hopper season in the canyon |
| Guided trips | Book ahead for June hatches | Three Rivers Ranch, South Fork Lodge |
| Fly shop | Henry's Fork Anglers | (208) 558-7525, Last Chance |
Flow~10,250 CFS
Trendfalling
Clarityfair (turbidity in upper section from reservoir drawdown)
Temp62-66°F
Bionic Hopper #10-12 (tan and purple—HOPPER-DROPPER IS THE PRIMARY TECHNIQUE right nowfish hard to grassy banks and foam lines)Chubby Chernobyl #8-10 (hopper-dropper top fly—pair with small rubberlegs dropper imitating Mutant Stone nymphs)Schroeder's Parachute Hopper #8-10 (fish hard to banks)
Flow~762 CFS (Island Park), ~1,012 CFS (Box Canyon)
Trendfalling
Clarityclear
Temp52-60°F
Parachute Hopper #8-10 (terrestrials now a primary pattern—work tight to grassy banks)Foam Ant #16-18 (black—deadly on calm afternoons 1pm-5pm)Foam Beetle #14-16 (shaded banks and overhanging vegetation)Chubby Chernobyl #8-10 (hopper-dropper top fly)
Flowlow and stable
Trendstable
Claritygin clear
Temp58-65°F
Parachute Hopper #8-10 (HOPPER FISHING IS EXCELLENT—the canyon is prime hopper water through September)Dave's Hopper #8-10 (cutthroat crush hoppers along high grass banks)Foam Ant #16-18 (calm water and shaded banks)Foam Beetle #14-16
🎣 TACTICS RIGHT NOWDry FlyBionic Hopper #10-12 (South Fork—tan/purpleHOPPER-DROPPER IS THE PRIMARY TECHNIQUE across all rivers right now)Schroeder's Parachute Hopper #8-10 (South Fork and Teton—fish hard to banks)Parachute Hopper #8-10 (Henry's Fork and Teton—terrestrials dominating)Dave's Hopper #8-10 (Teton canyon—cutthroat crush hoppers along high grass banks)Chubby Chernobyl #8-10 (hopper-dropper top fly on all rivers—pair with small rubberlegs dropper)Gee's Supafly Stone Dry #6-10 (golden—South Fork Mutant Stone game still viable at dawn but winding down)Bionic Ant 2.0 #16 (black—all riversdeadly on calm mornings and afternoons)Foam Beetle #14-16 (shaded banks and overhanging vegetation)PMD Thorax #16-20 (South Fork—PMDs still active in tailouts and softer water)Mahogany Dun #14-16 (increasing across all rivers—activating with cloud cover and cooler days)Parachute BWO #20-22 (all rivers—expect increased activity with incoming cooler weather)Yellow Sally Dries #14-16 (riffles and fast water edges)Caddis Dries #14-16 (Spotted Sedge and evening caddis still present)Sparse CDC Dries #16-22 (Ranch headhunting—thinsparse designs imitating bug hatches)
NymphTungsten Pat's Rubber Legs #4-12 (brown/black/orange—anchor fly for all nymph rigsBox Canyon deep seams and South Fork)TH Duracell Jig #12-18 (South Fork—hot nymph pattern right now)Perdigons #14-18 (tungsten bead—effective morning nymphing before terrestrial action fires)Tunghead Pheasant Tail #14-18 (South Fork and Henry's Fork)PMD Nymphs #16-18 (all rivers—still a primary subsurface food source)Pheasant Tail #16-18 (Teton and Henry's Fork dry-dropper)Caddis Pupa #14-16 (all rivers—afternoon emergence)Zebra Midges #14-18 (all rivers—redblackolive)Lightning Bug #12-18 (South Fork attractor)Split Case PMD Emerger #16-18 (Henry's Fork meadow—match rise forms when PMDs show)BWO Nymphs #18-20 (carry for overcast days)Scuds #14-16 (Portneuf and Teton spring-fed sections)
StreamerSmall Minnow Streamers #6-8 (South Fork—SURPRISINGLY GOOD right nowsmaller patterns imitating minnows outperforming large articulated flies)Double Bunny #4-6 (black—South Forkdeep and slow through shaded runs in early morning)Sparkle Minnow #4-6 (South Fork—olive-over-whitegold)Sculpzilla #2-4 (South Fork—long pauses along cut banks in low light)Black Leeches #4-6 (Henry's Fork—very effective low and slow during wind or low-light periods)Small Dark Streamers #8-10 (Teton and Henry's Fork—early morning through deeper pools)Black Woolly Buggers #8-10 (Teton)Olive Balanced Leeches #10-12 (Teton deeper pools)
FORECASTLate August marks the transition toward fall across southeastern Idaho. South Fork flows have dropped to ~10,250 CFS from 12,000+ as summer irrigation demand eases—expect continued decline through late August into September as flows stabilize and transitional water opens. Turbidity persists in the upper section from Palisades Reservoir drawdown. Water temp at 66°F—fish early and be off the water by noon on hot days. HOPPER-DROPPER has become the primary technique on the South Fork, with the Mutant Stone morning game winding down. Streamer fishing surprisingly productive with smaller minnow-imitating patterns. COOLER WEATHER INCOMING: weekend forecast brings mid-80s with afternoon showers—expect Mahogany Dun and BWO hatches to fire and extended fishing windows on cloudy days. As flows continue dropping toward 8,000-9,000 CFS, conditions should improve further. Henry's Fork at ~762 CFS at Island Park—good wade access. Late summer has arrived with hot weather dominating. PMD hatches occasional rather than reliable. Terrestrials the primary game. Lower river thermal stress remains serious below Ashton. Teton River in true late-summertime shape: low, gin-clear, excellent hopper fishing in the canyon—recent rain has helped conditions. All rivers: the transition to fall is approaching—BWOs will return in force, Mahogany Duns will increase, and streamer fishing for pre-spawn browns begins to come into play through September.Late August pattern shifting: hot early week (highs 90-92°F) giving way to cooler conditions (85°F Saturday, 81°F Sunday) with afternoon showers and thunderstorms likely. Overnight lows in the upper 30s to low 40s. WARM WATER remains the primary concern—South Fork water temp at 66°F (warming through afternoon), Henry's Fork 52-60°F, Teton 58-65°F. The 66°F reading on the South Fork is near the stress threshold—strictly fish mornings on hot days. Incoming cloud cover and precipitation should trigger stronger Mahogany Dun and BWO emergence and extend the productive fishing window. Wind remains the biggest daily variable—afternoon gusts to 35 mph common, shifting surface fishing to streamers. South Fork dropping to ~10,250 CFS from Palisades Dam as irrigation demand eases—turbidity persists in the upper section from reservoir drawdown. Henry's Fork flows at ~762 CFS—stable with good wade access but thermal stress on the lower river below Ashton remains a serious concern. Fish early (6am launch) and finish by noon on hot days. The cooler weather this weekend could be some of the best fishing days of late August.
Overview
Southeastern Idaho holds some of the finest trout water in North America. The Henry's Fork and South Fork of the Snake River draw anglers from around the world for their prolific hatches, wild trout populations, and mountain scenery. Add the Teton River's native Yellowstone cutthroat and the Portneuf's accessible brown trout fishing, and you have water that can occupy a lifetime.
The area sits at the headwaters of the Snake River drainage, with the Teton Range to the east and Yellowstone's high plateau to the north. Spring-fed sources keep many waters cool through summer (water temps typically run mid-50s to low 60s°F in upper stretches), supporting diverse insect populations and healthy trout.
Seasons and Conditions
Spring (April-May)
Rivers run high and off-color from snowmelt. The South Fork, as a tailwater below Palisades Dam, remains fishable when freestone rivers blow out. Focus on nymphing and streamers. Water temps are cold (often 40s°F), so slow your presentations and fish midday warmth.
Early Summer (June)
The magic window. Salmonfly hatches start late May on lower sections and progress upstream through June. Those 2-3 inch stoneflies bring every fish in the river to the surface. The Henry's Fork sees its famous green drake and brown drake hatches starting mid-June. Pale Morning Duns emerge across all rivers. This is prime time, but expect company. Harriman Ranch's June 15 opener draws anglers from across the country.
Peak Summer (July-August)
Outstanding dry fly fishing continues with PMDs, caddis, yellow sallies, and terrestrials. Hoppers, ants, and beetles become effective along grassy banks from July through September. Water temps in the mid-50s to low 60s are ideal; above 68°F, fish mornings and evenings. The South Fork runs high (8,000-12,000 CFS) for irrigation. Fish foam lines and edges.
Fall (September-October)
Cooling temps trigger renewed hatches and aggressive fish. Blue-winged olives return in force. Brown trout become territorial as spawn approaches, and streamer fishing excels. The South Fork drops to 2,000-4,000 CFS by mid-September, opening excellent wade fishing. Crowds thin considerably.
Winter (November-March)
Fishing slows but doesn't stop on tailwaters. The South Fork runs 900-1,200 CFS with water temps dipping to 38°F. Midge hatches occur on warm afternoons. Target 11am-3pm and expect slow, methodical fishing. Wade access opens up significantly at these flows.
Henry's Fork of the Snake River
The Henry's Fork is arguably the most celebrated dry fly stream in the lower 48. Trout Unlimited once ranked it the top trout stream in the country. The river originates at Big Springs near Yellowstone, producing 120 million gallons of cold, clear water daily.
Box Canyon
Length: 3-3.5 miles from Island Park Dam to Last Chance
This narrow, boulder-strewn canyon offers fast pocket water. The canyon ranges from 100 feet wide at its widest to about 50 feet at its narrowest, lined with pines and littered with rocks.
Flow guidance:
- Below 600 CFS: Excellent wade fishing; work between boulders carefully
- 700-900 CFS: Good overall conditions; wading still manageable
- Above 1,200 CFS: Fish from a boat. Wading becomes difficult and dangerous
Techniques: Nymphing dominates here. Pat's Rubber Legs (#6-8), stonefly patterns, and attractor nymphs produce. At lower flows (around 780 CFS), mornings favor nymphs while evenings can produce streamer action.
Access: Gravel road just north of Pond's Lodge on US-20 leads to parking below the dam, about 2 miles. A hiking trail runs the canyon's length with multiple access points from Old Highway 191.
Harriman Ranch (Railroad Ranch)
Length: 6-7 miles through Harriman State Park
This meadow section is what made the Henry's Fork famous. The river slows into a wide, high-country meadow with views of the Centennial Mountains and Tetons. Large rainbow trout feed selectively in crystal-clear water on complex hatches.
The reality check: Experienced anglers argue this offers the most challenging light tackle fly fishing on the planet. The slow, clear water allows trout to inspect every offering. These fish are educated daily by skilled anglers. Many fish here for years before consistently hooking up. If it's your first trip, consider hiring a guide. The knowledge about current hatches and approach is invaluable.
Regulations: Catch-and-release only, fly fishing only, barbless hooks required. Season runs June 15 through November 30. Closed December 1 through June 14.
Timing and pressure: June 15 opener and the following week are extremely busy. The salmonfly hatch and Ranch opener draw anglers from surrounding states and countries. For solitude, fish late July through early fall or early spring before the opener. The Ranch fishes best just before dark, so plan to stay late.
What to bring: Small flies rule. Sizes 16-22 are common. Match the hatch precisely. Stop at Henry's Fork Anglers in Last Chance to find out what's hatching.
Lower River
Below Ashton Reservoir, the Henry's Fork takes on freestone character, flowing through agricultural land. Rainbow and brown trout populations are healthy, and fishing pressure is much lower than upstream sections. Easier wading access makes this a good place to build confidence before tackling the Ranch.
Henry's Fork Hatch Calendar
| Month | Major Hatches | Notes |
|---|
| June | Salmonflies, Golden Stones, Green Drakes, Brown Drakes, PMDs | Green drake hatch lasts 10-14 days, starts around 11am |
| July | PMDs, Caddis, Yellow Sallies, Green Drakes (late) | Golden stones follow salmonflies |
| August | Tricos, Terrestrials (hoppers, ants, beetles), Caddis | Fish mornings for tricos, terrestrials when wind is calm |
| September-October | BWOs, Mahogany Duns, Tricos | Renewed hatches with cooling temps |
South Fork of the Snake River
Often called the best cutthroat stream in the West, the South Fork flows 66 miles from Palisades Dam to its confluence with the Henry's Fork. This tailwater supports over 5,000 trout per mile, including wild Yellowstone and Snake River fine-spotted cutthroat, plus rainbow and brown trout ranging from 15 to 25 inches.
Understanding South Fork Flows
The South Fork is a tailwater controlled by irrigation demand. Flows change based on downstream agricultural needs (potatoes and sugar beets). Watch for rapid changes and avoid being caught on exposed gravel bars when releases increase.
| Flow Range | Conditions | Best Approach |
|---|
| 900-1,200 CFS | Winter flows; excellent wade access | Walk gravel bars, sight-nymph |
| 1,500-1,800 CFS | Upper sections; technical water | Wade inside bends, dry-dropper rigs |
| 4,000-8,000 CFS | Transitional; dropping from summer peaks | Drift boat fishing, streamers and nymphs |
| 8,000-12,000 CFS | Peak summer irrigation flows | Fish foam lines, edges, and banks from drift boat |
| Above 12,000 CFS | High water | Focus on slowest water, streamers tight to banks |
Water temps: Summer runs mid-50s to mid-60s°F in upper stretches. The tailwater stays cool even when air temps spike. Winter can dip to 38°F, so dress appropriately.
Float Sections
| Section | Put-in | Take-out | Miles | Float Time | Character |
|---|
| Upper | Palisades Dam (Husky) | Conant | 12 | 6-8 hours | Swift water, tree-lined banks, Falls Creek Falls, best canyon scenery |
| Upper Short | Husky | Spring Creek | 5 | 4-5 hours | Half-day option |
| Canyon | Conant | Cottonwood | 14 | Full day | Volcanic cliffs, cottonwood forest, largest bald eagle winter roost in Northern Rockies |
| Canyon Overnight | Conant | Byington | 25 | 2 days | 16 designated campsites; popular overnight trip |
| Lower Canyon | Cottonwood | Byington | 12 | Full day | High cliffs, Henry's Bathtub, Table Rock; requires early start |
| Heise | Byington | Lorenzo | 7 | 4-5 hours | "Brown town," big browns, Twin Bridges section excels during salmonfly hatch |
| Lower | Lorenzo | Menan | 8 | 5-6 hours | Amazon-like vegetation, dead tree piles, early salmonfly hatches, trophy browns |
Logistics note: Cottonwood (Fulmer) boat launch requires a long dirt road drive on the north side of the river. Plan 45+ minutes on rough road to reach Highway 26 via Heise.
Wade Fishing Access
While the South Fork is primarily a drift boat fishery, wade fishing is productive if you know where to go:
- Swan Valley Bridge: Easy access on Highway 26 or Snake River Road between the bridge and Fall Creek Falls. Best at winter flows (900-1,200 CFS).
- Conant area: Gravel bars around the access point; walk upstream or downstream.
- Byington flats: Wide gravel bars downstream of the ramp; best at lower flows.
Parking fees: BLM requires day or season pass at boat access sites (Fulmer, Byington, etc.) from May 24 through September 30. Day pass is $3.
South Fork Hatch Calendar
| Timing | Hatch | Patterns |
|---|
| May | Pre-runoff nymphing | Cheater Belly Stonefly Nymph (#2-8), Pat's Rubber Legs (#6-8) |
| Late June-Early July | Salmonfly (4 weeks) | Orange Water Walker (#4-8), Joe's Stone (#4), Salmonfly (#6) |
| July | Golden Stones | J-Slam Golden Stone (#4-10), Black Gold Stimulator (#6) |
| July-August | PMDs, Caddis, Hoppers | Pink Sparkle Dun (#16-20), Schroeder's Parachute Hopper (#8-10), Lightning Bug (#12-18) |
| Late August | Mutant Stones | Small stubby-winged stones; skitter flies early morning |
| September-October | BWOs, Streamers | Tungsten Split Case BWO (#18-20), Sex Dungeon (#2-4) for fall browns |
Teton River
The Teton River is one of the last strongholds for Yellowstone cutthroat trout. This 81-mile tributary of the Henry's Fork flows through Teton Valley, fed by springs that maintain near-constant water temperatures in upper sections.
Upper Teton
Slow meadow water with beautiful seams and eddies. Ideal dry fly territory for native cutthroat that rise aggressively to well-presented flies. Less pressure than Henry's Fork and South Fork, making it an attractive alternative during peak season.
Lower Teton Canyon
Faster pocket water with deeper pools holding some of the river's largest trout. More technical wading conditions.
Access Points
- Cache Bridge: 15 minutes north of Victor off Highway 33. Take W 4000 North.
- Bates Bridge to Big Eddy: Most popular section; expect some company during peak season.
- Harrop Bridge and below: Giant stoneflies in early June.
Teton River Hatches
- Early June: Giant stoneflies below Harrop Bridge (up to 3 inches)
- Mid-June through fall: PMDs, Caddis
- July through fall: Baetis, Mahogany Duns, Rusty Spinners
- Late July-September: Hoppers
- June-July: Grey Drakes (large mayflies, 1-1.5 inches)
Regulations: Memorial Day weekend through November 30, trout limit is 6 with no harvest of cutthroat trout. Catch and release encouraged for all cutthroat.
Portneuf River
For anglers based in Pocatello or seeking less-traveled water, the Portneuf offers solid brown trout fishing with easier access.
Below Lava Hot Springs
The lower river meanders through valley farmland with good populations of brown trout. Fish deeper holes, runs, undercut banks, and shaded areas under overhanging trees. A 5 or 6 weight rod with floating line works well. The high banks offer good visibility, and make stealth critical. It's easy to cast shadows and spook fish.
Above Lava Hot Springs
Upper reaches hold rainbow and Yellowstone cutthroat, plus occasional brook trout. The Kelly-Toponce area has beaver ponds with small wild fish, good for prospecting with attractor dries.
Techniques
Hopper-dropper rigs excel in summer. Woolly worms and San Juan worms (#10-16) produce year-round. Move around and seek active fish rather than camping in one spot.
Regulations
Above East Main Street Bridge in Lava Hot Springs: catch-and-release only December through Memorial Day weekend, no bait, barbless hooks required. Standard 6-trout limits the rest of the year, but cutthroat harvest is always prohibited. Parts through Fort Hall Reservation fall under tribal jurisdiction. A separate permit is required.
Note: A portion through Lava Hot Springs town is closed year-round (swimming and tubing area).
Beginner-Friendly Options
South Fork of the Snake: Consistent flows and abundant fish make it forgiving. Guided drift boat trips let beginners cover productive water while learning. Summer dry fly action provides plenty of practice opportunities. The sheer number of fish (5,000+ per mile) means more chances to connect.
Lower Henry's Fork: Below Ashton, easier wading access and less technical fish than Harriman Ranch. Build confidence here first.
Portneuf River: Accessible from Pocatello with less pressure. Brown trout aren't as selective as Henry's Fork rainbows, making it a good training ground without the technical demands.
Technical Water
Harriman Ranch: The pinnacle of dry fly difficulty. Flat, clear water. Fish that inspect every offering. Many anglers fish here for years before consistently catching fish. Come prepared with a full range of sizes in each pattern (often #16-22), long fine tippets (6X-7X), and patience. The Ranch fishes best at dusk.
Box Canyon: Fast pocket water requiring skilled nymphing. Slick boulders and strong current make wading challenging, especially above 1,000 CFS.
Upper Teton Canyon: Limited access and technical conditions for experienced waders seeking solitude.
Local Fly Patterns
Henry's Fork Essentials
- Lawson's Green Drake (#10-12), Mike Lawson's pattern, developed for this river
- Green Drake Cripple (#10-12), for picky risers
- Lawson's Green Drake Emerger (#10-12)
- Harrop's Hairwing Dun (PMD, #16-18)
- CDC Biot Comparadun (various colors, #16-20)
- Sparkle Dun (PMD, Callibaetis, #14-18)
- X-Caddis (#14-18)
- Parachute Trico (#20-22)
South Fork Essentials
- Orange Water Walker (#4-8), local favorite for salmonflies, twitch through flats
- Cheater Belly Stonefly Nymph (#2-8), all spring until salmonflies
- J-Slam Golden Stone (#4-10), guide favorite
- Schroeder's Parachute Hopper (#8-10), fish hard to the bank
- Pink Sparkle Dun (#16-20), PMD imitation
- Pink CDC Biot Dun (#16-20), dropper behind the Sparkle Dun
- Psycho May Nymph (#14-18), covers almost all mayfly nymphs
- Sex Dungeon (#2-4), fall browns
Local Fly Shops
Call ahead for current conditions. These folks fish these waters daily and know what's working.
Henry's Fork Area
Henry's Fork Anglers (Last Chance)
- Phone: (208) 558-7525
- Address: 3340 Hwy 20, Island Park, ID 83429
- Hours: 7am-7pm daily (Memorial Day-Fall); 9am-5pm Mon-Sat (Winter)
- Established 1976; Mike Lawson's shop
TroutHunter (Island Park)
- Phone: (208) 558-9900
- Address: 3327 N. Hwy 20, Island Park, ID 83429
- Full-service shop with restaurant and lodging
South Fork / Teton Valley Area
TRR Outfitters - Driggs
- Phone: (208) 354-1200
- Address: 76 N. Main Street #101, Driggs, ID 83422
- Licensed on Henry's Fork, South Fork, and Teton River
WorldCast Anglers (Victor)
- Downtown Victor, ID
- One of few outfitters licensed on the Teton River
Jimmy's All Season Angler (Idaho Falls)
- Phone: (208) 524-7160
- Local knowledge, friendly staff
Idaho Fishing Regulations
Idaho requires a fishing license for anyone 14 or older. Children under 14 fish free, though non-resident children's catch counts toward an accompanying adult's limit unless they purchase their own license.
Key points for southeastern Idaho (2025-2027 regulations):
- Standard Upper Snake Region limit: 6 trout (all species combined)
- Special rules vary by section, so always check current regs
- Live bait (fish, leeches, frogs, salamanders) prohibited
- Barbless hooks required on catch-and-release waters
- Chumming illegal statewide
Harriman Ranch special regs: Catch-and-release only, fly fishing only, barbless hooks. Open June 15-November 30 only.
Purchase licenses at Idaho Fish and Game, license vendors, regional offices, or by phone at (800) 554-8685.
Float Options
The South Fork is primarily floated by drift boat or raft. The 66-mile stretch from Palisades Dam is Class II water with no significant rapids, but current, sweepers, and obstacles require attention. Most anglers book with outfitters or lodges that provide boats and experienced guides.
Self-guided float logistics:
- Shuttle services available through local fly shops
- BLM parking fee required at boat launches (May 24-Sept 30)
- 16 designated campsites in the canyon section for overnight trips
- No camping in day-use parking lots (Byington, etc.)
- Kelly Island Campground (BLM) across from Byington for overnight stays
For whitewater elsewhere in Idaho, the state claims more navigable whitewater miles than any other in the lower 48, including the Middle Fork Salmon, Selway, and Hells Canyon of the Snake.
Safety Considerations
- Cold water: Tailwaters run cold year-round (38-55°F). Waders, studded boots, and a wading staff reduce hypothermia risk from falls.
- Rapid flow changes: The South Fork can change quickly from dam releases. Watch for rising water and don't get caught on gravel bars mid-river.
- Spring runoff: May and early June bring high, fast, discolored water on freestone rivers. Check South Fork Snake River flows at Heise before planning.
- Afternoon thunderstorms: Summer storms develop quickly. Watch the sky and know your exit routes.
- Wildlife: Bears, moose, and other wildlife are common. Store food properly and make noise on trails.
Getting There and Lodging
Airports:
- Idaho Falls (IDA): 45 minutes to South Fork, 90 minutes to Island Park
- Jackson Hole (JAC): 60 minutes to South Fork Lodge
- Salt Lake City: ~4 hours south
Fly Fishing Lodges:
Three Rivers Ranch (Warm River)
- Historic Orvis-endorsed lodge (first in 1974), Orvis Lodge of the Year
- Open May through November; day trips year-round
- Licensed on 16+ rivers including Henry's Fork, South Fork, Teton
- Phone: (208) 652-3750
South Fork Lodge (Swan Valley)
- On the South Fork; built 1998 by Mark Rockefeller
- Full-service fly shop, drift boat access to all sections
- 60 minutes from Jackson Hole
The Lodge at Palisades Creek (Irwin)
- Orvis-endorsed; open May-October
- Guided trips year-round on five South Fork sections (55 miles)
- Phone: (866) 393-1613
- 20 minutes from Idaho Falls Airport (Lorenzo take-out)
Henry's Fork Lodge (Island Park)
- Located near Harriman Ranch
- Focused on Henry's Fork and surrounding waters
Teton Valley Lodge (Driggs)
- Oldest continuously operating fly fishing lodge west of the Mississippi (since 1919)
- Access to South Fork, Henry's Fork, and Teton River
Conservation
The Henry's Fork Foundation has worked since 1984 to conserve the Henry's Fork watershed, 3,200 square miles spanning eastern Idaho and western Wyoming. Their science-based efforts include:
- 100+ research and monitoring projects completed
- Miles of riparian fencing to protect streambanks
- Water conservation programs (Precision Water Management, Farms and Fish)
- Real-time water quality monitoring (temperature, turbidity, dissolved oxygen)
- Collaboration with farmers to improve habitat while maintaining agricultural productivity
Support conservation by joining the foundation or practicing careful catch-and-release techniques. Handle fish minimally, keep them in the water, and use barbless hooks even where not required.
Using RiverReports
Check current conditions before your trip:
South Fork flow interpretation:
- 900-1,200 CFS: Winter flows, excellent wade access on gravel bars
- 1,500-1,800 CFS: Upper sections; sight-nymph and dry-dropper
- 8,000-12,000 CFS: Summer irrigation flows; fish from drift boat, target edges and foam lines
- Dropping flows in September signal the transition to prime fall fishing
Henry's Fork flow interpretation:
- 300-600 CFS: Low flows; wade Box Canyon, technical Ranch fishing
- 700-900 CFS: Good overall conditions
- Above 1,200 CFS: Box Canyon best fished from boat; Ranch can be challenging
Compare historical data to understand typical seasonal patterns and identify windows when flows stabilize after runoff.
