Fremont Lake
Sublette County, Wyoming5,400 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↓ down from A at the last regrade
- Oligotrophic
- #7 of 8 in the county
- 56 ft max depth
- Limited data
Fremont Lake in Sublette County, Wyoming has a water quality grade of B (Good). Water clarity: 42.8 ft visibility. Phosphorus: 10 µg/L. Surface area: 5400 acres.
- Clarity
- 42.8 ft
- Max depth
- ~56 ft est.
- Area
- 5,400 acres
- Type
- Oligotrophic
- Phosphorus
- 10 µg/L
- Trend
- ↓ Declining
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Watch Fremont Lake’s letter
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Fremont Lake is a 5,400-acre cold, clear oligotrophic lake in Sublette County, Wyoming with an estimated average depth of about 56 feet. Water quality is graded B based on 1 sampling years through 2019. 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. Grade methodology: LakeQuality methodology.
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 Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
Crystal clear, you can see 42.8 ft down. Phosphorus 10 µg/L. TSI 30. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 42.8 ft | Not graded |
| Phosphorus | 10 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 30 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~56 ft est. |
| Average Depth | ~6 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
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 Lake Campground2.9 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
Fishing Fremont Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.216 m/yr | 2 |
| Phosphorus | ↓ Declining | +177.36 µg/L/yr | 2 |
| Chlorophyll-a | ↓ Declining | +0.02 µg/L/yr | 2 |
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
County Ranking
Ranked #7 of 8 lakes in Sublette County
Nearby Lakes in Sublette County
Frequently asked questions about Fremont Lake
Where is Fremont Lake?
- Fremont Lake is a lake in Sublette County, Wyoming. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Fremont Lake?
- Fremont Lake in Sublette County, Wyoming has a water quality grade of B (Good). Water clarity: 42.8 ft visibility. Phosphorus: 10 µg/L. Surface area: 5400 acres.
Is Fremont Lake safe to swim in?
- The B is nutrients and algae, 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 Campground. 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
Species activity outlook by water temperature and season
Where to stay at Wyoming's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
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Other Grade B Lakes in Wyoming
Oligotrophic Lakes in Wyoming
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated 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