Omsrud Lake
Omsrud Lake in Brown County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1 ft visibility. Phosphorus: 199 µg/L. Chlorophyll-a (algae): 120 µg/L.
- Clarity
- 1 ft
- Mean depth
- ~10 ft est.
- Public access
- Yes
Next lake in Brown County
Why Omsrud Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Omsrud Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by MPCA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Omsrud Lake is a lake in Brown County, Minnesota with an estimated average depth of about 10 feet. The lake supports 3 documented fish species including black bullhead, common carp, and yellow perch. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2022-06-21. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Omsrud Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1 ft of visibility. Phosphorus level: 199 µg/L. Chlorophyll-a: 120 µg/L. Trophic State Index: 78.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | Not graded |
| Phosphorus | 199 µg/L | Not graded |
| Chlorophyll-a (Algae) | 120 µg/L | Not graded |
| Trophic State Index (TSI) | 78 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Omsrud Lake
Compare lakeside cabins, hotels, and vacation rentals near Omsrud Lake in Brown 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 Omsrud Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~10 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Minnesota has not published bathymetry for Omsrud Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Hanska Lake (South)Public
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Omsrud Lake
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Omsrud Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Hanska WwtpHanska · 3.7 mi away · NPDES MN0052663Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Graded lakes near Omsrud Lake
Omsrud Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Brown County
Frequently asked questions about Omsrud Lake
What is the water quality grade for Omsrud Lake?
- Omsrud Lake in Brown County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1 ft visibility. Phosphorus: 199 µg/L. Chlorophyll-a (algae): 120 µg/L.
Is Omsrud Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Omsrud Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Algae concentration (chlorophyll-a) is 120 µg/L. Always check local health department advisories before swimming.
How deep is Omsrud Lake?
- No published bathymetric survey covers Omsrud Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 10 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
What fish are in Omsrud Lake?
- Fish species found in Omsrud Lake include black bullhead, common carp, yellow perch. Omsrud Lake is located in Brown County, Minnesota.
Are there boat ramps on Omsrud Lake?
- Omsrud Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Hanska Lake (South). Public access is listed as yes.
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Where this data comes from
4 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA4 samples · 2022
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- 2120 B ~ Color in Water by Visual Comparison
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory