Drive up Lump Gulch toward Park Lake this month and you'll hit a closed road before you see any water. Past that point, the lake that hosted campers, anglers and paddleboarders all summer is a drained basin. In August, crews from CK May Excavating Inc. of Bozeman were pulling out the old earthen dam and preparing a foundation for its replacement. Some boulders were too big for heavy equipment, so the crews blasted them apart. A wildlife camera on the site caught a moose walking through the work zone.
The Forest Service hopes the lake will be back next summer. The dam is the part of that timeline crews can control. Getting water back into the basin is a different job, and nobody is scheduling it.
A Dam Built for Placer Mining
Park Lake sits in the Lump Gulch drainage, about 28 miles south of Helena. According to the Helena-Lewis and Clark National Forest, the original dam went up in the late 1800s. Chinese immigrants built it to supply water for the placer mining that helped build Helena. The Helena Ranger District now manages the dam, its water rights and the recreation sites around it. The dam was last upgraded in 2005.
The Forest Service's May 2026 project announcement says a 2022 annual inspection found increased seepage under the embankment, signs of possible erosion at the foundation, and abnormal changes in the dam's drainage system. Those findings moved the dam up the agency's repair list.
Forest spokesperson Chiara Cipriano explained to KTVH why patching wasn't enough: "Over time, the dams have the chance to fail, and so they mitigated the immediate risks, but a long-term solution was needed." The station reported that the new dam will have stabilizing columns to protect against earthquakes and barriers to stop future seepage. The $3.7 million project is funded through the Great American Outdoors Act and includes road restoration near the site.
The work went fast once it started. In February, KTVH reported that the project was still out to bid and construction hadn't begun. The Forest Service planned to drain the lake on July 15. The lake was drained in early July instead, a process that took about two weeks, sending nearly eight million gallons a day down Lump Gulch.
Four Dates, Each Measuring Something Different
Four dates frame the Park Lake project, two for the construction and two for the lake.
| Date | Source | What it describes |
|---|---|---|
| Through end of 2026 | Forest Service release, May 13, 2026 | Original planned closure of the day-use area and campground |
| End of 2026 | KTVH, Aug. 13, 2026 | When officials expected construction to be finished |
| Summer 2027 | KTVH, Aug. 13, 2026 | When the Forest Service hoped to reopen the lake |
| Oct. 31, 2027 | Forest Order 01-15-12-26-02 | Legal end of the area and road closure, unless rescinded sooner |
The signed closure order runs from June 1, 2026, through 11:59 p.m. on October 31, 2027, "unless rescinded." That gives the Forest Service room to reopen early if things go well and keeps the site closed through a full second season if they don't. Officials told KTVH the area stays closed until the work is complete.
Nobody Can Contract for Snowmelt
Here is what makes the summer 2027 hope uncertain. Forest Service staff told KTVH the lake "will be refilled over time naturally through rain and snowmelt." No pipeline or pumping schedule is involved. Once the new embankment is finished, the basin waits on whatever falls in the Lump Gulch drainage this winter and spring.
That makes the coming months the deciding stretch. A contractor can be held to a completion date. A snowpack can't. Construction was expected to wrap up by the end of 2026, which would have the dam ready before most of the year's melt. How full the lake gets by summer, and how soon the gate opens, will depend on how much water reaches it.
Cipriano's comments to KTVH show what's riding on it. "This is such a popular site," she said. "I know so many people who come out here for fishing, camping, just sitting out by the water paddleboarding, and so it's really nice to preserve it for the long term."
The Grayling Are Coming Back the Other Way
The fish are the least visible part of the project, and the most interesting.
Park Lake has been more than a fishing spot. The Forest Service calls it an important water source for raising Arctic grayling for Montana Fish, Wildlife & Parks' statewide restoration work. FWP's Park Lake page lists three species there: Arctic grayling, westslope cutthroat trout and Yellowstone cutthroat trout. In February, KTVH reported that draining would wait until after July 15 so biologists could harvest grayling first.
Before the water went out, FWP crews collected millions of eggs and some fish, which they expected would otherwise be flushed downstream. FWP fisheries biologist Coltan Pipinich told KTVH that the usual direction is now reversing: "Historically, we've been spawning fish at Park Lake and taking their eggs elsewhere. Now it's time for everyone else to kick back some fish to Park Lake and get that group of fish going."
FWP plans to restock and rebuild the grayling population in time for next spring's spawning season. That puts the fish on the same calendar as the anglers. The lake that supplied grayling to the rest of the state needs enough water back next spring to start supplying them again.
What's Closed Right Now, and What Isn't
The closure covers a specific area, and the boundaries matter if you spend time in the hills above Clancy. Forest Order 01-15-12-26-02 applies to National Forest System lands in the immediate area of Park Lake. It also covers all of Forest Road 4009, starting where it meets Forest Road 1878, which is the road into the day-use area and campground. The order lists violations as a Class B misdemeanor, with fines of up to $5,000 for individuals. Federal, state and local officers on duty, rescue and firefighting crews, and permit holders are exempt.
The road itself will change by the time it reopens. The contract calls for crews to blade the road from the Corral Gulch and Lump Gulch intersection up to Park Lake. The Forest Service said construction equipment would travel the area, but the work would not bring continuous haul traffic in and out.
Outside that closed area, the rest of the Helena-Lewis and Clark National Forest is open as usual. Christmas tree permits for the forest are sold through Recreation.gov for the November 1 to December 31, 2026 season. They cost $5 per tree, with a limit of three trees and a 12-foot height maximum. Check the permit map before you go, and stay out of the Park Lake area and FR 4009 corridor.
If you're waiting on the lake, these three sources will tell you when things change:
- The Forest Service alerts page. A rescinded or amended order will be posted at fs.usda.gov/r01/helena-lewisclark/alerts. That's the official signal that the gate is open.
- The Helena Ranger District. The district answers questions about the project at 406-449-5201.
- FWP's Park Lake page. Any updates on species or stocking will show up on the Park Lake waterbody page.
The Forest Service calls the new dam a long-term solution. The first season with water behind it depends on this winter's snow.
Cameron watches what happens in the Lump Gulch drainage and the forest above Clancy year-round, because projects like this shape how life in the hills feels from one season to the next. If you'd like to talk about where things stand around Clancy and Montana City this winter, Cameron Hahn is glad to share what he knows. Schedule a free consultation.
