Fremont Lake
Sublette County, Wyoming5,400 acresView mapDirections
Wyoming DEQ publishes the water-quality measurements for Fremont Lake. Here is what has been measured.
- Oligotrophic
- 56 ft max depth
- Limited data
Fremont Lake in Sublette County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 42.8 ft visibility. Phosphorus: 10 µg/L. Surface area: 5400 acres.
Fremont Lake is a 5,400-acre cold, clear oligotrophic lake in Sublette County, Wyoming with an estimated average depth of about 56 feet. Overall water quality is declining over recent sampling years. Compared to the 7 other monitored lakes in Sublette County, Fremont Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2019-09-10. Methodology: how these readings are compared.
What Fremont Lake is good for
From access and monitoring records, not editorial picks.
- Clear water42.8 ft of visibility
- Camping1 public campground nearby
- Big water5,400 acres
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Fremont Lake is safe to swim in today is a call for the Wyoming Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Fremont Lake
These are the measurements Wyoming DEQ publishes for Fremont Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 42.8 ft down. Phosphorus 10 µg/L. TSI 30.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 42.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 10µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 30 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Fremont Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~56 ft est.
Surface area
5,400 acres
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Wyoming has not published bathymetry for Fremont Lake.
Lake Size & Watershed
Watershed (drainage) area
101 sq mi
HydroLAKES / HydroSHEDS
Shoreline
21.6 mi
HydroLAKES / HydroSHEDS
Elevation
7,431 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
Public campgrounds near Fremont Lake
- Fremont Lake2.3 kmReserve
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 Fremont Lake
Compare lakeside cabins, hotels, and vacation rentals near Fremont Lake in Sublette County, Wyoming — 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 Fremont Lake
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Fishing Fremont Lake
Water quality readings over time
2 seasons of samples on record (2012–2017). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Stable2 years
Phosphorus
Worsening+177.36 µg/L/yr2 years
Chlorophyll-a
Worsening+0.02 µg/L/yr2 years
Reservoir Info (USACE NID)
Fremont Lake is a man-made reservoir impounded by the Fremont Lake (completed 1993), built primarily for irrigation on the Pine Creek; concrete-type dam, 15 ft tall and 230 ft long.
- Surface area
- 5,400 ac
- Normal storage
- 30,899 ac-ft
- Drainage area
- 96.2 sq mi
- Hazard class
- Low
- Owner
- TOWN OF PINEDALE - HIGHLAND IRRIGATION
All listed purposes: Irrigation;Fish and Wildlife Pond.
Source: USACE National Inventory of Dams, NID ID WY01662 · Operator website
Nearby Lakes in Sublette County
Frequently asked questions about Fremont Lake
Where is Fremont Lake?
- Fremont Lake is a lake in Sublette County, Wyoming. Its water-quality measurements are published by Wyoming DEQ and shown on this page as reported.
What is the water quality of Fremont Lake?
- Fremont Lake in Sublette County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 42.8 ft visibility. Phosphorus: 10 µg/L. Surface area: 5400 acres.
Is Fremont Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Fremont Lake?
- No published bathymetric survey covers Fremont Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 56 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 5400 acres.
Are there campgrounds on Fremont Lake?
- Fremont Lake has 1 public campground from USGS The National Map within 5 km, including Fremont Lake. 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.
Explore Fremont Lake across LakeQuality
2 thermal springs within 24.4 mi, nearest Steele Hot Springs
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Where this data comes from
24 measurements from 4 monitoring stations, 2019. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- State of Wyoming Department of Environmental Quality Watershed Program
WYDEQ_WATERSHED24 samples · 2019
Analytical methods
- Secchi
- Total Phosphorus After Block Digestion
Monitoring station identifiers (4)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Public campgrounds from USGS The National Map Structures, within about 3 miles