Painted Rocks Lake
Painted Rocks Lake in Ravalli County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 565 acres.
- Area
- 565 acres
- Public access
- Yes
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Why Painted Rocks Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Painted Rocks Lake, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Montana DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Painted Rocks Lake is a 565-acre lake in Ravalli County, Montana. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Montana DEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Painted Rocks Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Painted Rocks Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 565 acres |
| Public Access | Yes |
No bathymetric survey has been published for Painted Rocks Lake, so its depth is not documented here.
Recreation & Access
- Painted Rocks State Park - Slate CreekPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Painted Rocks Lake
Nearby Lakes in Ravalli County
Frequently asked questions about Painted Rocks Lake
Where is Painted Rocks Lake?
- Painted Rocks Lake is a lake in Ravalli County, Montana. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Painted Rocks Lake?
- Painted Rocks Lake in Ravalli County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 565 acres.
Is Painted Rocks Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Painted Rocks Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Painted Rocks Lake?
- Painted Rocks Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Painted Rocks State Park - Slate Creek. Public access is listed as yes.
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Where this data comes from
Measurements for Painted Rocks Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory