Live USGS flow data for 10 river sections across 5 major drainages. Updated every 15 minutes.
🌊
Runoff building
High-country melt accelerating — Gallatin, Flathead, and Madison rising fast
3
Optimal
4
Runnable
10
Total sections
1
Dangerous
Updated 12:16 PM MDT
0
No-Go
No-Go — Road closure: Going-to-the-Sun Road — no access
Montana · spring season
🌤️Weather
🚗Roads
⚠️Avy
🥾Trail
⛑️ Montana River Safety
MT rivers run colder than CO. Glacial-fed rivers like the Middle Fork Flathead stay below 50°F through July — wetsuit non-negotiable.
Hypothermia incapacitates in minutes. ·
Spring runoff is explosive. Flows can jump 3x in 48 hours during warm weather events — check gauges same day. ·
Wildlife awareness: grizzly bears frequent river corridors in Glacier and Yellowstone country — carry bear spray. ·
Tell someone your float plan and expected return before any backcountry river run.
🌊 Gallatin River
Gallatin CanyonGUIDED TRIPS
Gallatin River · 5,500 ft
⚠️ High WaterClass III–IV <span style="color:#f59e0b;">(IV–V at high water)</span>Season: May–July
2,220
CFS live
Classic Big Sky whitewater in Gallatin Canyon. Multiple Class III–IV sections through a dramatic limestone canyon south of Bozeman. House Rock and Mad Mile are the highlights.
0800 (optimal)2,200 (high)3,500+ CFS
2,220 CFS — above optimal, experienced paddlers only
💧 Water temp: ~43°F🥶 Hypothermia: HIGH — wetsuit mandatory
🌫️Foggy · 40°F💨 9 mph (gusts 11)🌧 89% precip
📍 Put-in: Gallatin Canyon, US-191 south of Big Sky (multiple access points) 🏁 Take-out: Axtell Bridge or Gateway Bridge, US-191
US-191 parallels the river through the canyon. Multiple BLM access points. Commercial outfitters in Bozeman and Big Sky.
Fed by Yellowstone NP snowmelt — peaks late May to mid-June. Mad Mile section is continuous Class IV at optimal flows. Gallatin Gateway area mellows to Class II–III.
Montana's premier commercial rafting run. Class III–IV Alberton Gorge cuts through Grave Creek Canyon west of Missoula. Fang Rapids and Cliffside are the signature drops. One of the best raft runs in the Northern Rockies.
08,000 (optimal)25,000 (high)40,000+ CFS
19,700 CFS — ideal flows for this section
💧 Water temp: ~50°F🥶 Hypothermia: HIGH — wetsuit mandatory
I-90 access (exits 66 & 75). Cyr and Tarkio boat ramps. Multiple commercial outfitters based in Missoula. Day-use fee at Cyr.
Clark Fork is a large-volume river — flows in tens of thousands of CFS during peak runoff. Fang Rapid and Cliffside are Class IV at mid-high water. Commercially operated May–July.
Mellow Class I–II Clark Fork through Missoula. Popular paddling stretch for beginners and stand-up paddleboarding. Post-Milltown Dam removal opened natural river corridor.
04,000 (optimal)15,000 (high)25,000+ CFS
6,380 CFS — ideal flows for this section
💧 Water temp: ~50°F🥶 Hypothermia: HIGH — wetsuit mandatory
☁️Overcast · 59°F💨 14 mph (gusts 21)🌧 35% precip
📍 Put-in: Milltown State Park, Bonner 🏁 Take-out: Turah access, east of Missoula
Multiple access points through Missoula. Milltown State Park is free. Popular with SUP/kayak.
Post-dam removal stretch has gravel bars and restored habitat. Great for beginners. Missoula kayak shops rent gear.
Middle Fork Flathead (Essex to West Glacier)GUIDED TRIPS
Middle Fork Flathead River · 3,200 ft
⚠️ High WaterClass III–IV <span style="color:#f59e0b;">(IV–V at high water)</span>Season: May–July
14,300
CFS live
National Wild & Scenic River corridor along Glacier NP's southern boundary. Class III–IV whitewater through remote wilderness canyon. Access to Glacier NP viewpoints from the water.
03,000 (optimal)10,000 (high)18,000+ CFS
14,300 CFS — above optimal, experienced paddlers only
💧 Water temp: ~49°F🥶 Hypothermia: HIGH — wetsuit mandatory
📍 Put-in: Moccasin Creek take-out or Essex access, US-2 🏁 Take-out: West Glacier boat ramp
US-2 access (West Glacier/Essex). Commercial outfitters in Whitefish and West Glacier. Permit not required but check USFS Flathead NF for current conditions.
North Fork Flathead (Ford to Polebridge)GUIDED TRIPS
North Fork Flathead River · 3,500 ft
⛔ DANGEROUSClass II–III <span style="color:#f59e0b;">(III–IV at high water)</span>Season: May–August
14,800
CFS live
Wild & Scenic North Fork along Glacier NP's western edge. Class II–III with excellent wildlife viewing (grizzly, moose, wolves). Multi-day floating through remote terrain.
02,000 (optimal)8,000 (high)14,000+ CFS
14,800 CFS — extremely hazardous, stay off water
💧 Water temp: ~49°F🥶 Hypothermia: HIGH — wetsuit mandatory
Montana's signature river float through Paradise Valley between Gardiner and Livingston. Class II–III with stunning Absaroka Range views. World-class blue-ribbon trout fishery doubles as a rafting destination.
05,000 (optimal)18,000 (high)30,000+ CFS
11,200 CFS — ideal flows for this section
💧 Water temp: ~44°F🥶 Hypothermia: HIGH — wetsuit mandatory
📍 Put-in: Carbella fishing access or Yankee Jim Canyon put-in (north of Gardiner) 🏁 Take-out: Point of Rocks fishing access or Pine Creek access near Livingston
MT FWP fishing access sites along US-89. Multiple commercial outfitters in Gardiner and Livingston. Excellent day-trip logistics.
The longest undammed river in the lower 48. Yankee Jim Canyon is the most technical section (Class III–IV). Paradise Valley below is mellower but still engaging. Spring runoff peaks late May.
Yellowstone River (Livingston to Springdale)GUIDED TRIPS
Yellowstone River · 4,480 ft
⚠️ High WaterClass I–II <span style="color:#f59e0b;">(II–III at high water)</span>Season: May–September
22,000
CFS live
Class I–II float through the Shields River confluence area east of Livingston. Great scenery, prolific fishing, and straightforward floating for families and beginners.
04,000 (optimal)16,000 (high)28,000+ CFS
22,000 CFS — above optimal, experienced paddlers only
💧 Water temp: ~46°F🥶 Hypothermia: HIGH — wetsuit mandatory
Spectacular Class IV–V whitewater through BLM's Bear Trap Wilderness Canyon — Montana's only BLM designated wilderness. 9 miles of continuous technical whitewater with no road access mid-canyon. Advanced kayakers only.
01,000 (optimal)2,500 (high)4,000+ CFS
470 CFS — too low to run
💧 Water temp: ~45°F🥶 Hypothermia: HIGH — wetsuit mandatory
BLM Bear Trap Wilderness. No egress mid-canyon — full commitment required. McAtee Bridge take-out on US-84. Entratis (Ennis area) can assist with shuttle.
Montana's most committing whitewater run. Beartrap is flow-regulated by Ennis Lake. Flows are relatively consistent vs snowmelt rivers. Inspect Wall rapid before committing. Expert kayakers only — no commercial rafting.
Madison River (Ennis to Varney Bridge)GUIDED TRIPS
Madison River · 4,985 ft
🟦 RunnableClass I–IISeason: May–October
931
CFS live
Class I–II Madison float through prime fly-fishing water. Braided channels, riffles, and outstanding wildlife in the shadow of the Madison Range. Popular with drift boats and raft-and-fish trips.
01,000 (optimal)3,500 (high)6,000+ CFS
931 CFS — below optimal but runnable
💧 Water temp: ~44°F🥶 Hypothermia: HIGH — wetsuit mandatory