Lower Red Rock Lake
Lower Red Rock Lake in Beaverhead County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 2218 acres.
- Area
- 2,218 acres
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Why Lower Red Rock 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 Lower Red Rock 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.
Lower Red Rock Lake is a 2,218-acre lake in Beaverhead County, Montana.
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 Lower Red Rock 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 Lower Red Rock Lake
Compare lakeside cabins, hotels, and vacation rentals near Lower Red Rock Lake in Beaverhead County, Montana — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lower Red Rock Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2,218 acres |
No bathymetric survey has been published for Lower Red Rock Lake, so its depth is not documented here.
Fishing Lower Red Rock Lake
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Frequently asked questions about Lower Red Rock Lake
Where is Lower Red Rock Lake?
- Lower Red Rock Lake is a lake in Beaverhead 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 Lower Red Rock Lake?
- Lower Red Rock Lake in Beaverhead County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 2218 acres.
Is Lower Red Rock Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lower Red Rock Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Lower Red Rock Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.