Mosomo Lake
Mosomo Lake in Itasca County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 4.5 ft visibility. Phosphorus: 24 µg/L. Chlorophyll-a (algae): 15.3 µg/L. Maximum depth: 30 ft. Surface area: 48.09 acres.
- Clarity
- 4.5 ft
- Typical in August
- 60°F
- Max depth
- 30 ft
- Area
- 48 acres
- Type
- Eutrophic
- Public access
- Yes
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Mosomo Lake →
Next lake in Itasca County
Mosomo Lake is a 48-acre productive, nutrient-rich eutrophic lake in Itasca County, Minnesota with a maximum depth of 30 feet. Water quality is graded D based on 3 sampling years through 2022. Limited fish-species data available. Public access is available. Compared to the 71 other monitored lakes in Itasca County, Mosomo Lake ranks #68 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2022-10-26. Grade methodology: LakeGrade methodology.
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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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Murky, only visible to about 4.5 ft. Phosphorus level: 24 µg/L. Chlorophyll-a: 15.3 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.5 ft | Not graded |
| Phosphorus | 24 µg/L | Good |
| Chlorophyll-a (Algae) | 15.3 µg/L | Poor |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Mosomo Lake
Compare lakeside cabins, hotels, and vacation rentals near Mosomo Lake in Itasca 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Mosomo Lake are listed below.
Top-rated places to stay near Mosomo Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Minnesota’s top lakes →
Water Temperature
Mosomo Lake typically sits around 60°F at the surface in August. Summer average is about 59°F. Usually warmest in Jul (about 60°F) and coldest in Oct (about 45°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 218 field readings (2022–2022) via the EPA Water Quality Portal. See the full Mosomo Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 30 ft |
| Surface Area | 48 acres |
| Shoreline Length | 1.1 mi |
| Littoral Zone | 40% |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fishing Mosomo Lake
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 1983-08-24 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Yellow Perch | 78.88 | 0.16 lb |
| Walleye | 2.25 | 1.15 lb |
| White Sucker | 0.25 | 2 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
From the 1983-08-24 survey
PERCH POPULATION VERY HIGH. WALLEYE POPULATION ABOUT AVERAGE.
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Mosomo Lake. 3 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — MosomoFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Mosomo (0662)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — MosomoPublic Water Access Sites · MN DNR LakeFinder
County Ranking
Ranked #68 of 72 lakes in Itasca County
Nearby Lakes With Higher Grades
Mosomo Lake holds Grade D. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Itasca County
Frequently asked questions about Mosomo Lake
What is the water quality grade for Mosomo Lake?
- Mosomo Lake in Itasca County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 4.5 ft visibility. Phosphorus: 24 µg/L. Chlorophyll-a (algae): 15.3 µg/L. Maximum depth: 30 ft. Surface area: 48.09 acres.
Is Mosomo Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Mosomo Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 15.3 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Mosomo Lake?
- Mosomo Lake typically sits around 60°F at the surface in August, from 218 EPA Water Quality Portal field readings (2022–2022). That is a typical value for the month, not a live reading.
How deep is Mosomo Lake?
- Mosomo Lake has a maximum depth of 30 feet. The lake covers 48.09 acres.
Explore Mosomo Lake across LakeGrade
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Where this data comes from
47 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Leech Lake Band of Ojibwe
LEECHLAK_WQX47 samples · 2022
Analytical methods
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Nitrate-Nitrite Nitrogen by Colorimetry
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.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder