Gravelly Range Lake
Gravelly Range Lake in Lewis and Clark County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 126 acres.
- Area
- 126 acres
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Why Gravelly Range 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 Gravelly Range 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.
Gravelly Range Lake is a 126-acre lake in Lewis and Clark 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 Gravelly Range 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 Gravelly Range Lake
Compare lakeside cabins, hotels, and vacation rentals near Gravelly Range Lake in Lewis and Clark 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.
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 126 acres |
No bathymetric survey has been published for Gravelly Range Lake, so its depth is not documented here.
Fishing Gravelly Range Lake
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Frequently asked questions about Gravelly Range Lake
Where is Gravelly Range Lake?
- Gravelly Range Lake is a lake in Lewis and Clark 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 Gravelly Range Lake?
- Gravelly Range Lake in Lewis and Clark County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 126 acres.
Is Gravelly Range Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Gravelly Range 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 Gravelly Range Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.