Morrison Reservoir
Platte County, Wyoming16 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↓ down from A at the last regrade
- Oligotrophic
- #8 of 9 in the county
- Limited data
Morrison Reservoir in Platte County, Wyoming has a water quality grade of B (Good). Water clarity: 14.4 ft visibility. Phosphorus: 10 µg/L. Surface area: 16 acres.
- Clarity
- 14.4 ft
- Area
- 16 acres
- Type
- Oligotrophic
- Phosphorus
- 10 µg/L
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Watch Morrison Reservoir’s letter
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Morrison Reservoir is a 16-acre cold, clear oligotrophic lake in Platte County, Wyoming. Water quality is graded B based on 1 sampling years through 2019. Compared to the 8 other monitored lakes in Platte County, Morrison Reservoir ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2019-09-09. Grade methodology: LakeQuality methodology.
What Morrison Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water14.4 ft of visibility
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)
Good clarity, visible to about 14.4 ft. Phosphorus 10 µg/L. TSI 38. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.4 ft | Not graded |
| Phosphorus | 10 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 16 acres |
No bathymetric survey has been published for Morrison Reservoir, so its depth is not documented here.
Fishing Morrison Reservoir
Reservoir Info (USACE NID)
Morrison Reservoir is a man-made reservoir impounded by the Morrison No. 2 (completed 1975), built primarily for irrigation on the North Chugwater Creek; earth-type dam, 32 ft tall and 595 ft long.
- Surface area
- 16 ac
- Normal storage
- 129 ac-ft
- Max storage
- 129 ac-ft
- Drainage area
- 0 sq mi
- Hazard class
- Low
- Owner
- DON WEDEMEYER
All listed purposes: Irrigation;Fire Protection, Stock, Or Small Fish Pond.
Source: USACE National Inventory of Dams, NID ID WY00160 · Operator website · Matched by proximity (0.05 km)
County Ranking
Ranked #8 of 9 lakes in Platte County
Nearby Lakes in Platte County
Frequently asked questions about Morrison Reservoir
Where is Morrison Reservoir?
- Morrison 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 Morrison Reservoir?
- Morrison Reservoir in Platte County, Wyoming has a water quality grade of B (Good). Water clarity: 14.4 ft visibility. Phosphorus: 10 µg/L. Surface area: 16 acres.
Is Morrison Reservoir safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Morrison Reservoir across LakeQuality
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
6 measurements from 1 monitoring station, 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_WATERSHED6 samples · 2019
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.