Yellow Water Reservoir
Yellow Water Reservoir in Petroleum County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 405 acres.
- Area
- 405 acres
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Why Yellow Water Reservoir 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 Yellow Water Reservoir, 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.
Yellow Water Reservoir is a 405-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 Yellow Water Reservoir
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 Yellow Water Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Yellow Water Reservoir 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 Yellow Water Reservoir
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 405 acres |
No bathymetric survey has been published for Yellow Water Reservoir, so its depth is not documented here.
Fishing Yellow Water Reservoir
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Frequently asked questions about Yellow Water Reservoir
Where is Yellow Water Reservoir?
- Yellow Water Reservoir 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 Yellow Water Reservoir?
- Yellow Water Reservoir in Petroleum County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 405 acres.
Is Yellow Water Reservoir safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Yellow Water Reservoir 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 Yellow Water Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.