Fishing in Sweet Grass County, Montana

What this local map set contains

The Sweet Grass County directory currently covers 9 lakes or reservoirs, 1 river. 9 charts use measured bathymetry from a published source; 1 chart is clearly labeled as modeled. Recorded maximum depths range from 10 to 120 ft, with a median of 40 ft. Those figures describe each chart's deepest recorded or modeled point, not a safe navigation depth.

Species records are attached to 10 of 10 waters. The most frequently cataloged targets are Rainbow Trout (8), Smallmouth Bass (7), Channel Catfish (6), Crappie (6) and Lake Trout (6). These are coverage counts, not abundance estimates or catch forecasts; open the individual map to see the evidence and seasonal context attached to that water.

Three useful maps to compare first

1. Lightning Lake: 120 ft maximum; survey-backed contours; 9 cataloged target species.
2. Fish Lake (Sweet Grass): 40 ft maximum; survey-backed contours; 9 cataloged target species.
3. Jordan Lake (Sweet Grass): 30 ft maximum; survey-backed contours; 9 cataloged target species.

Start with a survey-backed chart when exact contour shape matters most. Use a modeled chart as broad planning context, then verify depths on the water. Comparing the three examples above also shows whether this area offers one dominant basin type or genuinely different shallow, deep, lake and river options. Access is separate from map coverage: confirm launches, shore rights, closures and posted rules before making the trip.