Ruby River Reservoir
Ruby River Reservoir in Madison County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 949 acres.
- Area
- 949 acres
Next lake in Madison County
Swipe left or right on this bar to open the next or previous lake.
Why Ruby River 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 Ruby River 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.
Ruby River Reservoir is a 949-acre lake in Madison County, Montana.
Source: EPA Water Quality Portal sampling records, Montana DEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Ruby River Reservoir water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Ruby River 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 Ruby River Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Ruby River Reservoir in Madison 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 Ruby River Reservoir
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Montana’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 949 acres |
No bathymetric survey has been published for Ruby River Reservoir, so its depth is not documented here.
Fishing Ruby River Reservoir
Nearby Lakes in Madison County
Frequently asked questions about Ruby River Reservoir
Where is Ruby River Reservoir?
- Ruby River Reservoir is a lake in Madison 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 Ruby River Reservoir?
- Ruby River Reservoir in Madison County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 949 acres.
Is Ruby River Reservoir safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Ruby River Reservoir is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Ruby River Reservoir across LakeQuality
More Montana Lake Rankings
Other Lakes in Montana
Where this data comes from
Measurements for Ruby River Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.