Little Bear Lake
Little Bear Lake in Petroleum County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 140 acres.
- Area
- 140 acres
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Why Little Bear 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 Little Bear 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.
Little Bear Lake is a 140-acre lake in Petroleum 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 Little Bear 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 Little Bear Lake
Compare lakeside cabins, hotels, and vacation rentals near Little Bear Lake in Petroleum 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 Little Bear Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 140 acres |
No bathymetric survey has been published for Little Bear Lake, so its depth is not documented here.
Fishing Little Bear Lake
Nearby Lakes in Petroleum County
Frequently asked questions about Little Bear Lake
Where is Little Bear Lake?
- Little Bear Lake is a lake in Petroleum 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 Little Bear Lake?
- Little Bear Lake in Petroleum County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 140 acres.
Is Little Bear Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Little Bear 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 Little Bear Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.