Festo Lake
Platte County, WyomingView mapDirections
Nutrients and algae run above the regional average.
↑ up from F at the last regrade
- Hypereutrophic
- #9 of 9 in the county
- 18 ft max depth
- Limited data
Festo Lake in Platte County, Wyoming has a water quality grade of D (Nutrient-rich). Water clarity: 0.8 ft visibility. Phosphorus: 159.5 µg/L.
- Clarity
- 0.8 ft
- Max depth
- ~18 ft est.
- Type
- Hypereutrophic
- Phosphorus
- 159.5 µg/L
- Trend
- ↓ Declining
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Stays near Festo Lake
Compare lakeside cabins, hotels, and vacation rentals near Festo Lake in Platte 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Festo Lake are listed below.
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Watch Festo Lake’s letter
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Festo Lake is a highly nutrient-loaded hypereutrophic lake in Platte County, Wyoming with an estimated average depth of about 18 feet. Water quality is graded D based on 1 sampling years through 2018. Overall water quality is declining over recent sampling years. Compared to the 8 other monitored lakes in Platte County, Festo Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2018-09-04. Grade methodology: LakeQuality methodology.
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 D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 0.8 ft of visibility. Phosphorus 159.5 µg/L. TSI 79. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.8 ft | Not graded |
| Phosphorus | 159.5 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 79 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~18 ft est. |
| Average Depth | ~8 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Wyoming has not published bathymetry for Festo 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.
Fishing Festo Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.057 m/yr | 2 |
| Phosphorus | ↓ Declining | +40.67 µg/L/yr | 2 |
County Ranking
Ranked #9 of 9 lakes in Platte County
Nearby Lakes in Platte County
Frequently asked questions about Festo Lake
Where is Festo Lake?
- Festo Lake is a lake in Platte County, Wyoming. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Festo Lake?
- Festo Lake in Platte County, Wyoming has a water quality grade of D (Nutrient-rich). Water clarity: 0.8 ft visibility. Phosphorus: 159.5 µg/L.
Is Festo Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Festo Lake?
- No published bathymetric survey covers Festo Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 18 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Festo Lake across LakeQuality
16.3 mi away · recorded at 70°F
Species activity outlook by water temperature and season
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Very high nutrients, dense algae, poor clarity
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Where this data comes from
12 measurements from 1 monitoring station, 2015–2018. 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_WATERSHED12 samples · 2015–2018
Analytical methods
- Secchi
- Total Phosphorus After Block Digestion
Monitoring station identifiers (1)
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)