Fishing in Boulder County, Colorado

What this local map set contains

The Boulder County directory currently covers 8 lakes or reservoirs. No chart in this set currently has measured bathymetry; 8 charts are clearly labeled as modeled. Recorded maximum depths range from 7 to 299 ft, with a median of 71 ft. Those figures describe each chart's deepest recorded or modeled point, not a safe navigation depth.

Species records are attached to 8 of 8 waters. The most frequently cataloged targets are Cutthroat Trout (6), Rainbow Trout (5), Brown Trout (3), Bluegill (2) and Brook Trout (2). 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. Boulder City Reservoir: 20 ft maximum; modeled contours; 9 cataloged target species.
2. Gross Reservoir: 299 ft maximum; modeled contours; 8 cataloged target species.
3. Barker Reservoir: 118 ft maximum; modeled contours; 8 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.