Compare 4 documented access options before you commit to a shoreline or launch.
View access →Montana reservoir guide
Painted Rocks Reservoir Fishing
Painted Rocks Reservoir is a Bitterroot Valley destination where camping, boating, reservoir level, scenery, and current regulations drive the trip.
LocationRavalli County, Montana
Primary targetsRainbow Trout
Best seasonSpring to early summer
Lake sizeabout 565 acres
Access4 documented options
Guide reviewed
Start here
Plan Painted Rocks Reservoir in 60 seconds
Make the trip decisions first. Use the deeper lake science, surveys, stocking history, and source material below when you want more detail.
Start with the documented species list, then open a species guide for seasonal behavior and practical tactics.
Choose a fish →Use verified depth information to identify basins, breaks, points, channels, and other structure before you fish.
View depth information →Wind, rain, temperature, and changing access can alter the plan quickly. Check current conditions before leaving.
Check conditions →Lake details
Depth, size & key facts
Elevationabout 4,728 feet
Public launches2
Summer cautionHeat
Lake depth map
Depth contours may take a little time to load. Sorry for the inconvenience.
Contour line20 ft Visible depth label
Source: Montana Fish, Wildlife & Parks. Historical survey data may not reflect current water levels or underwater hazards. Informational only; not for navigation.
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Trip conditions
Current conditions
Loading the local forecast. Check access and official notices before leaving.
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Four day outlook
Tools
Today's Lure Pick
Open Tools for species-specific lure guidance.
Fishery record
Documented fish species
These species come from the lake record. Open a species guide for identification, seasonal behavior, and practical tactics without confusing general species guidance with a lake-specific survey result.
Trout and salmon
Rainbow Trout
Use bait, small spinners, spoons, or slow trolling depending on access.
View species guide
Trout and salmon
Westslope Cutthroat Trout
See seasonal habitat, presentations, identification, and regulation cautions.
View species guide
Whitefish
Mountain Whitefish
See cold-water habitat, seasonal movement, and presentation tips.
View species guide
Trout and salmon
Bull Trout
See seasonal habitat, presentations, identification, and regulation cautions.
View species guide
Trout and salmon
Brown Trout
See seasonal habitat, presentations, identification, and regulation cautions.
View species guide
Trout and salmon
Brook Trout
See seasonal habitat, presentations, identification, and regulation cautions.
View species guide
Stocking information
Painted Rocks Reservoir Fish Stocking
Recent stocking information summarized from Montana Fish, Wildlife & Parks. Dates and quantities can change. Always verify current fishing rules with the official agency before fishing.
Most recent stockings
| Date | Species | Quantity | Size | Details |
|---|---|---|---|---|
| Jun 20, 1984 | Westslope Cutthroat Trout | 5,494 | 4 in avg length | Washoe Park Trout Hatchery · Montana FWP Fish Stocking Records |
| Jun 24, 1982 | Westslope Cutthroat Trout | 5,465 | 5 in avg length | Washoe Park Trout Hatchery · Montana FWP Fish Stocking Records |
Source: Montana Fish, Wildlife & Parks Last checked: Sep 5, 2026 11:13am
Fishery intelligence
Official fishery evidence
Agency survey records and measured fishery data, distilled for trip planning.
6
verified signals
Research & surveys
Agency-backed record
Use the evidence
Turn records into a fishing plan
- Compare survey evidence with the seasonal guide.
- Use the map to connect depth, access, and structure.
- Confirm current rules and access before your trip.
Angler interpretation
How the fishery changes through the seasons
This is the practical layer: use it alongside the documented species, depth, stocking, survey, access, and regulation record above. The current season opens first.
Spring
trout- Start here
- Cooler water, recent stocking, fish moving shallow, and protected shorelines or inlets that warm first.
- Watch for
- Cold fronts, changing water levels, muddy inflow, and early-season ramp conditions.
Summer
listed species- Start here
- Fish early or late, then adjust toward deeper water, shade, vegetation, or comfortable temperature zones.
- Watch for
- Heat, weeds, algae, heat, and heavier boat traffic.
Fall
trout- Start here
- Cooling water, shoreline structure, points, weed edges, and simple presentations that let you cover water.
- Watch for
- Wind on open water, rapidly changing weather, and shorter daylight windows.
Winter
trout- Start here
- Legal open-water or ice access, stable depth zones, and conservative cold-weather trip plans.
- Watch for
- Ice safety where relevant, ramps, road conditions, cold-water exposure, and current rules.
Know before you go
Rules and restrictions
Check the current Montana Western District regulations for Painted Rocks Reservoir and connected West Fork Bitterroot waters before fishing.
Getting on the water
Access and launches
Painted Rocks State Park has a ramp and dock, but low reservoir levels can limit the state-park ramp to hand launching. The Forest Service Little Boulder launch may remain the trailer-launch alternative; check current alerts before travel.
Sorry, there are no mapped boat ramps for this lake yet. Check the access information below for other ways to reach the water.
More launch links
Official field updates Recent surveys and fishing pressure
Official surveys and pressure information can help with trip planning. Conditions change, and these updates do not guarantee current fishing.
Rainbow trout, Cutthroat trout, Mountain whitefish
Montana FWP’s 2021 winter pressure appendix lists Painted Rocks Reservoir with estimated winter angler days. Use as light pressure context.
Rainbow trout, Cutthroat trout, Mountain whitefish
Montana Fish, Wildlife & Parks source check includes angling pressure, popularity, effort, or use context for Painted Rocks Reservoir. Use this to compare crowd and pressure risk.
Rainbow Trout, Mountain Whitefish
Montana Fish, Wildlife & Parks source check includes angling pressure, popularity, effort, or use context for Painted Rocks Reservoir. Use this to compare crowd and pressure risk.
Explore by region or target
More ways to explore this fishery
Use FishyNW fishing hubs to compare this water with other relevant lakes and rivers without starting another search.
Keep exploring
Nearby waters
The four closest FishyNW lake guides by straight-line distance.
Lake Como
25.2 miles away · Lake
Targets include Rainbow Trout, Westslope Cutthroat Trout, Kokanee.
Georgetown Lake 60.0 miles away · LakeTargets include Rainbow Trout, Brook Trout, Kokanee.
Clark Canyon Reservoir 84.6 miles away · LakeTargets include Rainbow Trout, Brown Trout, Burbot.
Harpers Lake 85.9 miles away · LakeTargets include Rainbow Trout, Westslope Cutthroat Trout.
Did you know?
What makes Painted Rocks Reservoir distinctive
Painted Rocks Reservoir sits at roughly 4,728 feet in elevation, so seasonal access and water temperature can differ sharply from lowland lakes.
FishyNW documents 6 fish species here, giving Painted Rocks Reservoir an unusually broad mix of fishing opportunities.
Painted Rocks Reservoir is documented in Ravalli County County with a dedicated FishyNW fishing and access profile.
Research & monitoring
Water science & monitoring
Loading available public monitoring and fishery science. Use this as supporting research, not as a live fishing report.
Pass 3 · depth + water column
Seasonal Fish Habitat
Surface · 0 ft
How to read this data
Temperature, dissolved oxygen, clarity, nutrients, chlorophyll-a, pH, and conductivity are observations from public monitoring records and may be historical. Thermocline depth is shown only when FishyNW can derive a strong vertical temperature gradient from a measured profile. It is not treated as a permanent lake characteristic.
Trophic indication uses the Carlson Trophic State Index only when FishyNW can normalize a measured chlorophyll-a, Secchi, or total-phosphorus value. It is a derived ecological indicator, not an agency impairment determination.
Seasonal Fish Habitat is shown only when verified bathymetry overlaps a same-day, same-station temperature and dissolved-oxygen profile. It is a historical screening snapshot, not a live prediction of where fish are located.
For lake trout, FishyNW uses the broader USGS-tested screening combination of water at or below 15°C (59°F) and dissolved oxygen at or above 4 mg/L. For other coldwater species, FishyNW does not invent a preferred-temperature threshold; it shows only the observed thermocline-to-oxygenated-depth refuge when the evidence supports it.
Harmful-algae status is never inferred from missing data. Always check the linked state source for current advisories before contact recreation.
Open matched Water Quality Portal recordsSources & feedback
Verified resources
Official links for this lake
Open the source that matches what you are planning.
Community feedback
See something that needs an update?
Send the correction and, when possible, the source. FishyNW reviews submissions before changing the guide.