Missionary Lake
Lake County, Minnesota99 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Missionary Lake. Here is what has been measured.
- 71 ft max depth
- Limited data
Missionary Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 16.5 ft visibility. Maximum depth: 71 ft. Surface area: 98.61 acres.
Missionary Lake is a 99-acre lake in Lake County, Minnesota with a maximum depth of 71 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-07-06. Methodology: how these readings are compared.
What Missionary Lake is good for
From access and monitoring records, not editorial picks.
- Clear water16.5 ft of visibility
- Deep water71 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Missionary 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 Missionary Lake
These are the measurements Minnesota PCA publishes for Missionary Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 16.5 ft down. TSI 37.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 16.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| 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. | 37 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Missionary Lake
Answers come straight from the public measurements and survey records on this page.
DNR Fisheries Survey Summary
2 surveys on file from MN DNR Fisheries. Most recent: 2025-08-19 (Targeted Survey).
From the 2025-08-19 survey
Temperature and dissolved oxygen (DO) measurements were collected from the deepest basin in Missionary Lake on August 19th, 2025, to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Trout, the most sensitive coldwater species present in this lake. During the…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Missionary Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — MissionaryFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
71 ft
Surface area
99 acres
Shoreline
2.6 mi
Littoral zone
23%
Share shallower than 15 ft
Public access
No
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Elevation
1,473 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Missionary Lake
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Top-rated places to stay near Missionary Lake
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Fishing Missionary Lake
Water Quality Trend: Worsening
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Nearby Lakes in Lake County
Frequently asked questions about Missionary Lake
Where is Missionary Lake?
- Missionary Lake is a lake in Lake County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Missionary Lake?
- Missionary Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 16.5 ft visibility. Maximum depth: 71 ft. Surface area: 98.61 acres.
Is Missionary Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Missionary Lake?
- Missionary Lake has a maximum depth of 71 feet. The lake covers 98.61 acres.
Can I fish at Missionary Lake?
- Public access to Missionary Lake is listed as no on the lake record, so confirm before you make the trip. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
18 measurements from 6 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA18 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
Monitoring station identifiers (6)
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.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder