Morrison Reservoir
Platte County, Wyoming16 acresView mapDirections
Wyoming DEQ publishes the water-quality measurements for Morrison Reservoir. Here is what has been measured.
- Oligotrophic
- Limited data
Morrison Reservoir in Platte County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 14.4 ft visibility. Phosphorus: 10 µg/L. Surface area: 16 acres.
Morrison Reservoir is a 16-acre cold, clear oligotrophic lake in Platte County, Wyoming. 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. Methodology: how these readings are compared.
What Morrison Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water14.4 ft of visibility
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 Morrison Reservoir 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 Morrison Reservoir
These are the measurements Wyoming DEQ publishes for Morrison Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 14.4 ft. Phosphorus 10 µg/L. TSI 38.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 14.4ft | 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. | 38 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Morrison Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
16 acres
No bathymetric survey has been published for Morrison Reservoir, so its depth is not documented here.
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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)
Nearby Lakes in Platte County
Frequently asked questions about Morrison Reservoir
Where is Morrison Reservoir?
- Morrison Reservoir is a lake in Platte County, Wyoming. Its water-quality measurements are published by Wyoming DEQ and shown on this page as reported.
What is the water quality of Morrison Reservoir?
- Morrison Reservoir in Platte County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 14.4 ft visibility. Phosphorus: 10 µg/L. Surface area: 16 acres.
Is Morrison Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Morrison Reservoir across LakeQuality
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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)
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.