"On the low side, sure would be nice to have a little more." That was the October 1 note on the flow below Hebgen Dam in Big Sky Anglers' Madison River report. A few lines down, the same report called the stretch at Varney "Low. Floatable, but boney."
Anyone who has driven US 287 past the Cameron store this week has seen the same thing from the road. Gravel bars sit higher than they usually do in early October. Riffles that normally run smooth now break white over rock. This fall's weather didn't cause it. The thin water through Cameron goes back to a snow deficit in the Madison basin last winter, and to a reservoir upstream that started the year short and is still about four feet below full.
The Gauge Below Hebgen, Against Its Own History
The USGS station on the Madison below Hebgen Lake read about 778 cubic feet per second early on October 5, 2026. That reading is provisional. For that date, the station's long-term record puts the 25th percentile at about 829 cfs and the median at about 996 cfs. So the river leaving the dam is running below three-quarters of the readings on record for early October.
The local shop reports from October 1 were lower still. Big Sky Anglers listed the release at 655 cfs. Trout Stalkers in Ennis, quoted by Montana Outdoor on October 4, put it at 665 cfs. The two reports don't give observation times, so treat the release as roughly 650 to 670 cfs that day.
Here is how the water carried down the valley on October 1, from the dam to Ennis:
| Point on the river | Flow on Oct. 1, 2026 | Reported by |
|---|---|---|
| Below Hebgen Dam | 655 to 665 cfs | Big Sky Anglers, Trout Stalkers |
| Kirby | 753 cfs | Big Sky Anglers, Trout Stalkers |
| Varney | 861 cfs | Big Sky Anglers |
| Cameron | 872 cfs | Trout Stalkers |
| Ennis | 801 cfs | Trout Stalkers |
The river gains a little between the dam and Cameron. On that day it still reached Ennis with less water than it had at Cameron. All the way down, the starting volume at Hebgen sets the ceiling.
The Water Missing in October Went Missing Last Winter
NorthWestern Energy runs Hebgen Dam, and its spring notices explain where this fall's flows came from. On April 8, 2026, the company said drought, dry soils and low snowpack pointed to low Hebgen Reservoir levels for the season. It reported winter inflows at 89 percent of normal, Madison-basin snowpack at 66 percent, and the SNOTEL sites above Hebgen at 56 percent. Much of the winter's precipitation had fallen as rain instead of snow, and the low and mid elevations never built enough snowpack. NorthWestern said it would hold back early-season water so it could support river flows during the hottest stretch of summer and reduce stress on fish.
Things got worse from there. On April 14 the Montana Department of Natural Resources and Conservation described the state entering a sixth straight year of drought. It singled out the Madison for especially low snowpack and put southwestern streamflow outlooks at 60 to 80 percent of median. NorthWestern's May 21 update had Hebgen outflows at 448 cfs. They would stay below normal until the reservoir started filling faster. The update also showed a gap in runoff forecasts for May through July: the federal outlook was 210,000 to 225,000 acre-feet, and the company's own forecast was lower at 180,000. By June 1, the Natural Resources Conservation Service had Madison-basin snowpack at 19 percent of median and expected runoff to come early.
The dam's federal license is what turns that shortfall into October's low water. NorthWestern says the license sets requirements for both river flows and reservoir elevations. In a drought year there may not be enough water to meet the flow requirements and keep the lake above its minimum at the same time, so the company consults with agencies on how to manage what it has. The most recent operations update on NorthWestern's drought page is dated May 21, and it describes a reservoir that started the season short and was being managed conservatively. As of October 1, Hebgen was still roughly four feet from full pool.
The drought hasn't eased with fall. The U.S. Drought Monitor map released October 1 showed 37.77 percent of Montana in drought as of September 29. That figure covers the whole state, not the upper Madison in particular.
What Thin Water Changes Between Quake Lake and Ennis
The October 1 shop reports describe a river where the fish are still feeding but less water leaves less margin for mistakes. In the wade section below Quake Lake, Big Sky Anglers called the fishing "a little hit and miss." Trout were taking nymphs and jiggy streamers, and some were rising "at the right time and place." Montana Angler's October 2 report described the fishing as consistent but opportunistic. Small baetis emergers and winged ants were working, dry flies were hit or miss, and cloudy days near Quake Lake held the best chance of a stronger baetis hatch.
Danny Eiden, a guide with Trout Stalkers, gave two pieces of practical advice in the Montana Outdoor write-up, and both come down to low water:
- Go to a finer tippet when the fish turn selective in the slower, clearer flows.
- Skip the split shot. With this much moss in the river, he ties on a heavier bead to get the fly down.
The same report said fall baetis, midges and caddis were bringing fish up, and the hopper and terrestrial bite was winding down. Below Varney, rowers will need to pick their line carefully and give other boats room at the takeouts. Big Sky Anglers saw blue-winged olives hatching in the float section from time to time, especially on rainy days, and found nymphing productive at times in the upper part of that stretch.
Fall on the upper Madison usually means talk of lake-run brown trout. Montana Angler's fall outlook points to the water between Hebgen and Quake lakes and to Yellowstone National Park for those fish. None of the current reports confirm a brown trout run at Cameron.
Two Construction Sites Aimed at Years Like This One
The drought also gives context to a project that may show up along the river this fall. NorthWestern has identified two side-channel restoration sites about 11 river miles apart. One is upstream of Hyde Creek on BLM and state land in the Wall Creek Wildlife Management Area, at river mile 77.7. The other is near Morgan Gulch on BLM land, at river mile 66.6. Construction is expected from September through November 2026, pending project approvals.
The project page names spawning gravels and thermal refuge as key habitat the work is meant to improve. Those are the conditions trout depend on most when flows drop and water warms. According to NorthWestern, the work won't affect major access points, common put-ins and take-outs, or mainstem fishing access. Visitors may see temporary work zones and should stay clear of equipment. Once the channels are finished, anglers are asked to stay out of them during spawning seasons.
The Weeks Left Before the River Season Closes
Low water lines up with a fall calendar that is already shrinking around Cameron:
- Earthquake Lake Visitor Center was open daily through September 15. For the off-season, the Forest Service directs visitors to the Hebgen Lake Ranger District.
- Campfire Lodge posts an operating season that ends September 30.
- Madison River Campground, about 34 miles south of Ennis on US 287, runs from late May through mid-October, weather permitting.
- The Blue Moon Saloon and Cafe are open seasonally and ask guests to call for current hours.
- Archery season for deer and elk runs through October 18, and the general season runs October 24 through November 29.
- The general river season in FWP's Western District runs through November 30, unless a water has its own exception in the 2026 fishing regulations.
FWP's current emergency restrictions list includes the Big Hole and Sun River but nothing on the Madison. The page has no printed update date, so check it again before heading out. Outfitters, competitive events and organized groups still need a Special Recreation Permit for the Madison and its FWP and BLM access sites. For a day-to-day read on the release, the USGS gauge below Hebgen Lake gives the clearest answer. With the reservoir still about four feet short, any return to median October flows would depend on NorthWestern having water to release.
If you own riverfront near Cameron, or you're thinking about where to fish and float for the next twenty seasons, flow history is part of how a property on the upper Madison really lives. Dawn Myrvik has spent two decades in the Madison Valley and can walk you through how the river near a given stretch of frontage behaves in low-water years like this one. Connect with Dawn to start your Montana lifestyle search.
