What Thompson Lake offers and when to fish it

Thompson Lake sits in the Absaroka-Beartooth Mountains east of Livingston, about 40 miles up the East River drainage. It's a high-elevation reservoir—roughly 6,500 feet—that holds walleye, northern pike, and cutthroat trout in cold, clear water. The lake runs about 8 miles long and narrows in the middle, creating distinct fishing zones. Spring and fall are the strongest seasons here; summer heat pushes walleye deep, and winter ice closes access from November through April.

The character of Thompson Lake is different from the warm-water reservoirs closer to Livingston. The water stays cold year-round, which means the fish don't follow the same seasonal patterns you'd see in Hebgen or Canyon Ferry. Walleye bite best in low light—early morning, late evening, and overcast days—and they hold on structure: rocky points, the drop-offs along the main channel, and the deeper basins where the lake widens. Pike roam the shallower bays and weed edges, especially in spring when they're feeding hard after spawn.

Key Takeaways

  • Thompson Lake holds walleye and northern pike in cold mountain water, with spring and fall offering the most consistent fishing.
  • Walleye bite in low light on rocky structure and deep drop-offs; pike hunt the shallower bays and weed lines.
  • Access is by vehicle to the boat launch near the dam; the lake is closed by ice from November through April.
  • Montana fishing license and a conservation stamp are required; check current regulations for species-specific rules before you fish.
  • The East River drainage can flood in early summer from snowmelt, which affects water clarity and fish location.

Access and boat launch details

Thompson Lake has one developed public boat launch managed by the Montana Department of Fish, Wildlife and Parks. The launch sits near the dam on the south end of the lake and has a paved ramp, parking for trailers, and a small day-use area. The road to the launch is passable in summer and early fall but can be rough or closed after heavy snow or during spring runoff. Call the Livingston MFWP office before you go if the weather has been wet or if it's early in the season.

There is no gas station, store, or lodging at the lake itself. Livingston is the nearest town with services—about an hour's drive back down the valley. Bring fuel, water, and food with you. The lake has no developed camping, though dispersed camping is available on Forest Service land nearby. Check with the Absaroka-Beartooth Ranger District for current rules and conditions before you set up camp.

Walleye fishing: structure, timing, and tackle

Walleye at Thompson Lake respond to live bait and jigs better than to lures. The most consistent approach is a jig tipped with a live minnow—a 1/4-ounce to 3/8-ounce jig in white, chartreuse, or natural colors—worked slowly along the bottom in 15 to 35 feet of water. The rocky points on the east shore and the main channel drop-offs are the places to start. Fish early morning and late evening; if you're on the water at midday, focus on the deepest basins and the shadiest structure you can find.

Slip-sinker rigs with live minnows also work well, especially in spring when walleye are more active in shallower water. Set your rig to keep the bait 1 to 3 feet off the bottom and drift slowly along the structure. The water is clear, so use a 6- to 8-pound monofilament leader and keep your presentation subtle. Walleye in cold mountain lakes are often less aggressive than their warm-water cousins, so patience and a slow retrieve matter more than speed.

Fall is prime walleye time at Thompson Lake. As water temperature drops in September and October, walleye move shallower and feed more actively. The same structure holds fish, but you may find them in 12 to 25 feet rather than 25 to 40. Spring can be good too, but snowmelt often clouds the water in May and early June, making sight-feeding fish harder to locate.

Northern pike: bays, weed edges, and spring spawn

Pike at Thompson Lake are aggressive and respond well to larger lures and live bait. The shallow bays on the north and west ends of the lake hold pike year-round, but spring is when they're most active. After ice-out in late April or early May, pike move into the shallows to feed and spawn. Fish the weed edges, fallen timber, and rocky shallows with large swimbaits, spoons, or live sucker minnows. A 6- to 8-inch sucker on a quick-strike rig will draw strikes from pike in 3 to 10 feet of water.

Pike fishing slows in mid-summer when the water warms and pike retreat to deeper, cooler water. Fall brings them back to the shallows as water cools again. Lures that work well include large spoons (1 to 2 ounces), swimbaits in natural colors, and topwater plugs in low-light conditions. Use a wire or heavy monofilament leader—pike teeth are sharp and will cut through light line.

Cutthroat trout and the lake's other species

Thompson Lake also holds cutthroat trout, though they are less targeted than walleye and pike. Cutthroat in high-elevation lakes like this one often stay deep during the day and move to shallower water in early morning and evening. Small spinners, spoons, and dry flies work in the shallows at dawn and dusk. The cutthroat population is smaller than the walleye and pike populations, so check current regulations for any special rules or harvest limits before you fish for them.

The lake's food chain is built on small minnows and aquatic insects. Understanding what the fish are eating helps you choose the right bait and lure. In spring, insects are hatching and small minnows are active; in fall, minnows are fattening up for winter. Matching your presentation to the season's natural food source often makes the difference between a slow day and a good one.

Seasonal patterns and water conditions

Spring (late April through June) brings snowmelt that can cloud the water and raise the lake level. Walleye and pike are active but harder to locate in turbid water. Fish structure more deliberately and use live bait or larger lures that create vibration. By late May and June, if the water clears, fishing improves significantly.

Summer (July through August) is the slowest season. Water temperature rises, walleye go deep, and pike retreat to the coolest water they can find. Early morning and late evening are your only reliable windows. Midday fishing is tough unless you're willing to fish 40+ feet deep.

Fall (September through October) is the best time to fish Thompson Lake. Water cools, walleye and pike move shallower and feed actively, and the weather is often stable. Visibility is good, and fish are less picky about presentation. This is when most anglers plan their trips.

Winter (November through April) closes the lake to fishing due to ice. The road may also be impassable. Plan your Thompson Lake trips for spring through fall.

Montana fishing license and regulations

You need a valid Montana fishing license and a conservation stamp to fish Thompson Lake. Licenses are sold by the day, by the year, or by the three-day period. You can buy them online through the Montana Fish, Wildlife and Parks website or at sporting goods stores and tackle shops in Livingston.

Regulations for walleye, pike, and cutthroat change year to year and may include daily bag limits, size restrictions, and seasonal closures. Check the current Montana fishing regulations before you go. The MFWP website has the full regulation book, and the Livingston office can answer specific questions about Thompson Lake.

Frequently Asked Questions

What's the best month to fish Thompson Lake?

September and October are the most consistent. Water is cool, walleye and pike are active and shallow, and weather is stable. Spring (late May through June) can be good once snowmelt clears, but early spring is often cloudy. Summer is slow, and the lake is frozen from November through April.

Do I need a boat to fish Thompson Lake?

A boat is the most effective way to reach the best structure and cover water efficiently. The boat launch is developed and easy to use. Shore fishing is possible near the dam and in some of the bays, but you'll have fewer options and likely slower fishing than from a boat.

How far is Thompson Lake from Livingston?

Thompson Lake is about 40 miles from Livingston by vehicle, roughly an hour's drive up the East River road. The road is passable in summer and fall but can be rough or closed in winter and during spring runoff. Call ahead if conditions are uncertain.

What size fish should I expect?

Walleye typically run 12 to 18 inches, with some larger fish in the 20-inch range. Pike average 18 to 26 inches, and larger pike in the 30-inch class are caught but less common. Cutthroat trout are generally smaller, 10 to 14 inches. These are averages; individual fish vary.

Can I fish Thompson Lake in spring if the water is high and cloudy?

Yes, but it's harder. High water and poor visibility make it tougher to locate fish on structure. Use live bait or larger lures that create vibration and scent. Fish the deepest, most protected structure you can find. Wait for the water to clear if you can, or plan a trip later in the season when conditions improve.