FreeFishFishing in Montana: lake depth maps and where to start
Big reservoirs, cold mountain lakes and famous trout rivers. How to use Montana lake depth maps, notable waters, and where to find the official rules.
Montana is famous for its trout rivers, but its lakes and reservoirs are just as impressive. Montana Fish, Wildlife and Parks publishes bathymetry (depth) data for many lakes, and FreeFish shows it on the map. On big, deep water, those maps are the key to finding fish.
What you can fish for
Trout are the headline: rainbow, brown, cutthroat and brook trout in rivers and lakes, with lake trout in large, deep lakes. Eastern reservoirs have walleye, northern pike, smallmouth bass and yellow perch. Some waters also hold kokanee and even chinook salmon.
Waters to know
- Canyon Ferry Lake: a reservoir near Helena with walleye, yellow perch and rainbow trout.
- Flathead Lake: a large, deep, clear lake in northwest Montana known for lake trout.
- Fort Peck Reservoir: a huge reservoir on the Missouri River in the east, with walleye, northern pike, smallmouth bass and lake trout.
- The Missouri, Madison and Yellowstone rivers: among the best-known trout rivers in the country.
Using Montana depth maps
On large reservoirs, depth maps reveal old river channels, points and humps where walleye gather, especially along breaks next to flats. On deep, cold lakes, lake trout often relate to steep drop-offs and deep humps. Clear water means fish may hold deeper and spook more easily, so lighter line and natural colors help.
For rivers, maps are less important than reading the water. Our trout stream guide covers riffles, runs, pools and seams.
Through the seasons
Spring runoff can make rivers high and muddy, so many anglers turn to lakes and reservoirs, where walleye and pike move shallow. Summer is prime trout season on rivers once flows drop, and lake trout move deep. Fall offers excellent brown trout fishing and a strong walleye bite in reservoirs. Winter brings ice fishing on many lakes and reservoirs for perch, walleye, trout and pike.
Before you go
Montana regulations are organized by district and by water, and many rivers have special rules such as catch-and-release sections or lure restrictions. Check the official regulations from Montana Fish, Wildlife and Parks, linked below. Boats must be inspected for aquatic invasive species in many situations, so learn the requirements before you travel.
Official rules
Seasons, limits and license requirements change. The official source is the state agency: Montana fishing regulations and licenses.