Jordan Reservoir
Platte County, WyomingView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
- Mesotrophic
- #7 of 9 in the county
- Limited data
Jordan Reservoir in Platte County, Wyoming has a water quality grade of B (Good). Water clarity: 5 ft visibility. Phosphorus: 10 µg/L.
- Clarity
- 5 ft
- Type
- Mesotrophic
- Phosphorus
- 10 µg/L
- Trend
- ↑ Improving
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Watch Jordan Reservoir’s letter
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Jordan Reservoir is a mesotrophic lake in Platte County, Wyoming. Water quality is graded B based on 1 sampling years through 2020. Overall water quality is improving over recent sampling years. Compared to the 8 other monitored lakes in Platte County, Jordan Reservoir ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2020-09-15. 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 B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
Murky, only visible to about 5 ft. Phosphorus 10 µg/L. TSI 46. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | Not graded |
| Phosphorus | 10 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Jordan Reservoir
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.13 m/yr | 2 |
| Phosphorus | → Stable | 0 µg/L/yr | 2 |
County Ranking
Ranked #7 of 9 lakes in Platte County
Nearby Lakes in Platte County
Frequently asked questions about Jordan Reservoir
Where is Jordan Reservoir?
- Jordan Reservoir is a lake in Platte County, Wyoming. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Jordan Reservoir?
- Jordan Reservoir in Platte County, Wyoming has a water quality grade of B (Good). Water clarity: 5 ft visibility. Phosphorus: 10 µg/L.
Is Jordan Reservoir safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Jordan Reservoir across LakeQuality
More Wyoming Lake Rankings
Other Grade B Lakes in Wyoming
Mesotrophic Lakes in Wyoming
Where this data comes from
12 measurements from 1 monitoring station, 2019–2020. 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 · 2019–2020
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.