San Luis Lake
Alamosa County, Colorado798 acresView mapDirections
No nutrient or algae sampling on record from Colorado WQCD for this lake.
- Impaired · Ammonia
- Public access
San Luis Lake in Alamosa County, Colorado has water-quality measurements published by Colorado WQCD, shown here as reported. Surface area: 798 acres.
San Luis Lake is a 798-acre lake in Alamosa County, Colorado. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, CDPHE. Methodology: how these readings are compared.
What San Luis Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Camping1 public campground nearby
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. San Luis Lake is listed impaired under Clean Water Act §303(d) (IR 5) for ammonia, metals (other than mercury). Check local advisories before you swim.
Whether San Luis Lake is safe to swim in today is a call for the Water Quality Control Division of the Colorado Department of Public Health and Environment and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for San Luis Lake
These are the measurements Colorado WQCD publishes for San Luis Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about San Luis Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
798 acres
Public access
Yes
Listed by Colorado WQCD
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
Public campgrounds near San Luis Lake
- Mosca Campground San Luis Lakes State Wildlife Area1.3 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Stays via Stay22
Stays 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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Fishing San Luis Lake
EPA Impairment Status
San Luis Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit CORGCB19_A · Official waterbody report
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. Its water-quality measurements are published by Colorado WQCD and shown on this page as reported.
What is the water quality of San Luis Lake?
- San Luis Lake in Alamosa County, Colorado has water-quality measurements published by Colorado WQCD, shown here as reported. Surface area: 798 acres.
Is San Luis Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. San Luis Lake is listed impaired under Clean Water Act §303(d) (IR 5) for ammonia, metals (other than mercury). Check local advisories before you swim.
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. Public access is listed as yes.
Can I fish at San Luis Lake?
- San Luis Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Colorado's fish and wildlife agency, so check its current regulations before you go.
Are there campgrounds on San Luis Lake?
- San Luis Lake has 1 public campground from USGS The National Map within 5 km, including Mosca Campground San Luis Lakes State Wildlife Area. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
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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
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles