Morrison Lake
Clearwater County, MinnesotaView mapDirections
Minnesota PCA publishes the water-quality measurements for Morrison Lake. Here is what has been measured.
- Mesotrophic
Morrison Lake in Clearwater County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 12 ft visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 4 µg/L.
Morrison Lake is a mesotrophic lake in Clearwater County, Minnesota. Overall water quality is improving over recent sampling years. Compared to the 36 other monitored lakes in Clearwater County, Morrison Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-17. Methodology: how these readings are compared.
What Morrison Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12 ft of visibility
Swimming conditions
Readings onlyLow algae
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 Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Morrison Lake
These are the measurements Minnesota PCA publishes for Morrison Lake, 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 12 ft. Phosphorus 13 µg/L. Chlorophyll-a 4 µg/L. TSI 42.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 12ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 13µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 4µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 42 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Morrison Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Morrison Lake typically sits around 64°F at the surface in September. Summer average is about 73°F. Usually warmest in Jul (about 75°F) and coldest in Jan (about 31°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (31°F) to its warmest (75°F).
Typical surface water temperature by month, from 72 field readings (2010–2025) via the EPA Water Quality Portal. See the full Morrison Lake water temperature breakdown →
Stays via Stay22
Stays near Morrison Lake
Compare lakeside cabins, hotels, and vacation rentals near Morrison Lake in Clearwater County, Minnesota — 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.
Top-rated places to stay near Morrison Lake
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Fishing Morrison Lake
Water Quality Trend: Improving
Based on 6 years of monitoring (2020–2025).
Water clarity
Stable6 years
Phosphorus
Improving-0.6 µg/L/yr6 years
Chlorophyll-a
Improving-0.3 µg/L/yr6 years
Nearby Lakes in Clearwater County
Frequently asked questions about Morrison Lake
Where is Morrison Lake?
- Morrison Lake is a lake in Clearwater County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Morrison Lake?
- Morrison Lake in Clearwater County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 12 ft visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 4 µg/L.
Is Morrison Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Morrison Lake?
- Morrison Lake typically sits around 64°F at the surface in September, from 72 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Explore Morrison Lake across LakeQuality
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Where this data comes from
94 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Red Lake DNR
REDLAKE_WQX94 samples · 2020–2025
Analytical methods
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidity by Nephelometry
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.