San Luis Lake
San Luis Lake in Alamosa County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 798 acres.
- Area
- 798 acres
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Why San Luis 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 San Luis 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 CDPHE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
San Luis Lake is a 798-acre lake in Alamosa County, Colorado.
Source: EPA Water Quality Portal sampling records, CDPHE, 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 San Luis 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 San Luis Lake
Compare lakeside cabins, hotels, and vacation rentals near San Luis Lake in Alamosa County, Colorado — 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 San Luis Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 798 acres |
No bathymetric survey has been published for San Luis Lake, so its depth is not documented here.
Recreation & Access
- San Luis State ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing San Luis Lake
Nearby Lakes in Alamosa County
Frequently asked questions about San Luis Lake
Where is San Luis Lake?
- San Luis Lake is a lake in Alamosa County, Colorado. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for San Luis Lake?
- San Luis Lake in Alamosa County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 798 acres.
Is San Luis Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. San Luis Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on San Luis Lake?
- San Luis Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include San Luis State Park.
Explore San Luis Lake across LakeQuality
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Where this data comes from
Measurements for San Luis Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory