Sublett Reservoir
Cassia County, Idaho95 acresView mapDirections
No nutrient or algae sampling on record from Idaho DEQ for this lake.
- Impaired · Hydrologic alteration
- Public access
Sublett Reservoir in Cassia County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. Surface area: 95 acres.
Sublett Reservoir is a 95-acre lake in Cassia County, Idaho. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, IDEQ. Methodology: how these readings are compared.
What Sublett Reservoir 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. Sublett Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for hydrologic alteration, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Sublett Reservoir is safe to swim in today is a call for the Idaho Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Sublett Reservoir
These are the measurements Idaho DEQ publishes for Sublett Reservoir, 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 Sublett Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
95 acres
Shoreline
2.7 mi
Public access
Yes
Listed by Idaho DEQ
No bathymetric survey has been published for Sublett Reservoir, so its depth is not documented here.
Recreation & Access
- Sublett ReservoirPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Sublett Reservoir
- Sublett Cg3.4 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 Sublett Reservoir
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Fishing Sublett Reservoir
EPA Impairment Status
Sublett Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit ID17040210SK020_0L · Official waterbody report
Nearby Lakes in Cassia County
Frequently asked questions about Sublett Reservoir
Where is Sublett Reservoir?
- Sublett Reservoir is a lake in Cassia County, Idaho. Its water-quality measurements are published by Idaho DEQ and shown on this page as reported.
What is the water quality of Sublett Reservoir?
- Sublett Reservoir in Cassia County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. Surface area: 95 acres.
Is Sublett Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Sublett Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for hydrologic alteration, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Are there boat ramps on Sublett Reservoir?
- Sublett Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Sublett Reservoir. Public access is listed as yes.
Can I fish at Sublett Reservoir?
- Sublett Reservoir 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 Idaho's fish and wildlife agency, so check its current regulations before you go.
Are there campgrounds on Sublett Reservoir?
- Sublett Reservoir has 1 public campground from USGS The National Map within 5 km, including Sublett Cg. 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 Sublett Reservoir 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