Montana Reservoir Levels and Stream Flows
Dated Corps readings at Montana reservoirs, the Fort Peck weekly update and live USGS gauges on lakes and rivers.
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Sources behind the Montana reservoir and stream numbers
Three kinds of reading show up on Montana water pages. Army Corps of Engineers Access to Water gives dated pool elevation, inflow and outflow at 9 reservoirs here and stage plus outflow at 32 stream sites. USGS gauges load live on 43 river pages and 5 lake pages.
Fort Peck Lake also carries the Corps weekly update, printed with its report date.
Every Corps value is printed with its time. Flood storage and conservation storage numbers are left out on purpose.
USACE Access to Water (water.usace.army.mil), dated readings as served, read November 12, 2026. Not live.
Photo of Great Falls: V Smoothe, CC BY 2.0
Dated Corps readings at Montana reservoirs
| Reservoir | Pool elevation | Inflow | Outflow | Reading time |
|---|---|---|---|---|
| Bighorn Lake (Big Horn County) | 3,626.44 ft | 1,709 cfs | 1,539 cfs | Nov. 12, 1:00 p.m. MST |
| Canyon Ferry Lake | 3,785.63 ft | – | 2,989 cfs | Nov. 12, 1:00 p.m. MST |
| Clark Canyon Reservoir | 5,520.07 ft | – | 25 cfs | Nov. 12, 1:00 p.m. MST |
| Flathead Lake | 2,890.83 ft | 4,700 cfs | 7,210 cfs | Nov. 12, 12:00 a.m. MST |
| Hungry Horse Reservoir | 3,537.59 ft | 794 cfs | 2,400 cfs | Nov. 12, 1:00 p.m. MST |
| Lake Koocanusa | 2,441.89 ft | 3,340 cfs | 4,000 cfs | Nov. 12, 12:00 p.m. MST |
| Noxon Rapids Reservoir | 2,326.68 ft | 11,200 cfs | 13,400 cfs | Nov. 12, 12:00 p.m. MST |
| Thompson Falls Reservoir | 2,396.05 ft | – | 10,279 cfs | Nov. 12, 12:00 a.m. MST |
| Tiber Reservoir | 2,986.29 ft | 433 cfs | 515 cfs | Nov. 12, 1:00 p.m. MST |
USACE Access to Water (water.usace.army.mil), dated readings as served, read November 12, 2026. Not live.
The Corps weekly update for Fort Peck Lake
Pool elevation for Fort Peck Lake from the USACE weekly update dated November 10, 2026. The report puts the pool 12.7 feet below base of Annual Flood Control Zone.
USACE Missouri River Basin Water Management weekly update dated November 10, 2026 (report PDF), read November 12, 2026. A weekly value, not live.
- Fort Peck Lakeweekly update dated November 10, 2026
Corps stage and outflow readings on Montana streams
| Stream | River stage | Outflow | Reading time |
|---|---|---|---|
| Beaverhead River | 3.32 ft | 222 cfs | Nov. 12, 1:00 p.m. MST |
| Big Hole River | 3.32 ft | 222 cfs | Nov. 12, 1:00 p.m. MST |
| Bighorn River | 1.22 ft | 1,902 cfs | Nov. 12, 1:00 p.m. MST |
| Bitterroot River | 4 ft | – | Nov. 12, 12:45 p.m. MST |
| Blackfoot River | 2.1 ft | – | Nov. 12, 12:30 p.m. MST |
| Blacktail Deer Creek | 3.47 ft | 120 cfs | Nov. 12, 1:00 p.m. MST |
| Clark Fork River | 5.53 ft | – | Nov. 12, 12:45 p.m. MST |
| Dearborn River | 3.51 ft | 76 cfs | Nov. 12, 1:00 p.m. MST |
| East Fork Bitterroot River | – | – | Nov. 12, 12:15 p.m. MST |
| Flathead River | 8.51 ft | – | Nov. 12, 12:30 p.m. MST |
| Gallatin River | 5.14 ft | 730 cfs | Nov. 12, 1:00 p.m. MST |
| Jefferson River | 3.32 ft | 222 cfs | Nov. 12, 1:00 p.m. MST |
| Kootenai River | 1,464.03 ft | – | Nov. 12, 12:30 p.m. MST |
| Little Bighorn River | 2.64 ft | 113 cfs | Nov. 12, 1:00 p.m. MST |
| Little Blackfoot River | 0.71 ft | – | Nov. 12, 12:30 p.m. MST |
| Little Prickly Pear Creek | 2.8 ft | 2,598 cfs | Nov. 12, 12:00 p.m. MST |
| Madison River | 1.66 ft | 461 cfs | Nov. 12, 12:00 p.m. MST |
| Marias River | 3.42 ft | 509 cfs | Nov. 12, 1:00 p.m. MST |
| Middle Fork Flathead River | 1.97 ft | – | Nov. 12, 12:45 p.m. MST |
| Milk River | 4.39 ft | 121 cfs | Nov. 12, 1:00 p.m. MST |
| Missouri River | 6.7 ft | 3,458 cfs | Nov. 12, 1:00 p.m. MST |
| Musselshell River | 2.31 ft | 41 cfs | Nov. 12, 12:00 p.m. MST |
| North Fork Flathead River | 1.83 ft | – | Nov. 12, 12:45 p.m. MST |
| North Fork Sun River | 2.04 ft | 144 cfs | Nov. 12, 1:00 p.m. MST |
| Rock Creek (Granite County) | 5.33 ft | – | Nov. 12, 12:45 p.m. MST |
| Ruby River | 3.32 ft | 222 cfs | Nov. 12, 1:00 p.m. MST |
| South Fork Flathead River | 4.88 ft | – | Nov. 3, 6:45 a.m. MST |
| South Fork Sun River | 2.04 ft | 144 cfs | Nov. 12, 1:00 p.m. MST |
| Sun River | 3 ft | 4,120 cfs | Nov. 12, 12:00 p.m. MST |
| Thompson River | – | – | Nov. 12, 12:45 p.m. MST |
| Yaak River | 3.12 ft | – | Nov. 12, 12:45 p.m. MST |
| Yellowstone River | 42.9 ft | 5,440 cfs | Nov. 12, 1:00 p.m. MST |
USACE Access to Water (water.usace.army.mil), dated readings as served, read November 12, 2026. Not live.
USGS lake gauge feeds across Montana
| USGS gauge | Latest reading | Time (ET) |
|---|---|---|
| Flathead Lake At Polson Mt | 2,890.72 ft lake elevation | Nov 14 2:30 pm |
| Hungry Horse Reservoir Nr Hungry Horse Mt | 3,537.34 ft lake elevation | Nov 14 2:45 pm |
| Hebgen Lake Near West Yellowstone, Mt | 6,529.96 ft lake elevation | Nov 14 2:45 pm |
| Lake Sherburne At Sherburne Mt | 4,747.77 ft lake elevation | Nov 14 3:00 pm |
| Lake Como Near Darby, Mt | 4,205.27 ft lake elevation | Nov 14 2:30 pm |
US Geological Survey provisional data, retrieved Nov 14, 2026 3:33 pm ET. Provisional readings can be revised.
- Flathead LakeUSGS lake gauge
- Hungry Horse ReservoirUSGS lake gauge
- Hebgen LakeUSGS lake gauge
- Sherburne LakeUSGS lake gauge
- Lake ComoUSGS lake gauge
USGS Water Data for the Nation, live through the site, retrieved on page view.
Montana river pages that load live USGS flow
- Beaverhead River4 gauges
- Big Hole River4 gauges
- Big Spring Creek1 gauge
- Bighorn River4 gauges
- Bitterroot River3 gauges
- Blackfoot River2 gauges
- Boulder River (Sweet Grass County)1 gauge
- Clark Fork River4 gauges
- Clarks Fork Yellowstone River2 gauges
- Dearborn River1 gauge
- Flathead River4 gauges
- Gallatin River3 gauges
- Jefferson River3 gauges
- Judith River2 gauges
- Kootenai River1 gauge
- Little Bighorn River4 gauges
- Little Blackfoot River2 gauges
- Little Prickly Pear Creek1 gauge
- Madison River4 gauges
- Marias River4 gauges
- Middle Fork Flathead River1 gauge
- Milk River4 gauges
- Missouri River4 gauges
- Musselshell River4 gauges
- North Fork Sun River1 gauge
- Poplar River2 gauges
- Powder River2 gauges
- Red Rock River1 gauge
- Rock Creek (Carbon County)1 gauge
- Rock Creek (Granite County)1 gauge
- Ruby River3 gauges
- Shields River2 gauges
- Smith River3 gauges
- South Fork Sun River1 gauge
- Stillwater River (Stillwater County)1 gauge
- Sun River4 gauges
- Swan River1 gauge
- Thompson River1 gauge
- Tobacco River1 gauge
- Tongue River4 gauges
- Whitefish River1 gauge
- Yaak River1 gauge
- Yellowstone River4 gauges
USGS Water Data for the Nation, live through the site, retrieved on page view.
Montana water levels, answered
Are the Montana reservoir readings live?
No. Corps values are dated readings printed with their time; the USGS gauges are the live part and load on the page.
Which agency publishes the reservoir elevations?
The Army Corps of Engineers through its Access to Water site; Fort Peck also has the Corps weekly update.
Why is there no storage figure?
Flood and conservation storage are rule-curve numbers that a reader could misread, so only elevation, inflow, outflow and stage are shown.
How many Montana reservoirs have a Corps reading here?
9 have Corps readings and a page here.
Which streams have live flow?
43 river pages load USGS readings, listed above.
What does stage mean?
The height of the water surface at the gauge, in feet, relative to the gauge’s own zero.
How often does the Fort Peck update change?
Weekly; the date printed beside the value is the report date.
Are these figures official?
Corps and USGS flag provisional data as provisional, and live gauge numbers can be revised.