Wellner-Hageman Reservoir
Brown County, Minnesota75 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Wellner-Hageman Reservoir. Here is what has been measured.
- Eutrophic
- 24 ft max depth
- Public access
Wellner-Hageman Reservoir in Brown County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 3.7 ft visibility. Phosphorus: 45 µg/L. Chlorophyll-a (algae): 30.3 µg/L. Maximum depth: 24 ft. Surface area: 74.92 acres.
Minnesota DNR's Standard Survey on July 25, 2022 caught 3.00 walleye per gill net at Wellner-Hageman Reservoir. Length samples in the latest survey that recorded them ran 17–26 inches. DNR survey details →
Wellner-Hageman Reservoir is a 75-acre productive, nutrient-rich eutrophic lake in Brown County, Minnesota with a maximum depth of 24 feet. Overall water quality is declining over recent sampling years. The lake supports 9 documented fish species including black bullhead, black crappie, and bluegill. Public access is available. Compared to the 3 other monitored lakes in Brown County, Wellner-Hageman Reservoir ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2023-10-11. Methodology: how these readings are compared.
What Wellner-Hageman Reservoir is good for
From access and monitoring records, not editorial picks.
- Fishing9 species recorded
Swimming conditions
Readings onlyAlgae risk
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 Wellner-Hageman Reservoir 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 Wellner-Hageman Reservoir
These are the measurements Minnesota PCA publishes for Wellner-Hageman Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 3.7 ft. Phosphorus 45 µg/L. Chlorophyll-a 30.3 µg/L. TSI 60.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 45µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 30.3µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 60 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Wellner-Hageman Reservoir
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Wellner-Hageman Reservoir typically sits around 53°F at the surface in October. Summer average is about 74°F. Usually warmest in Jul (about 75°F) and coldest in Oct (about 53°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (53°F) to its warmest (75°F).
Typical surface water temperature by month, from 236 field readings (2017–2023) via the EPA Water Quality Portal. See the full Wellner-Hageman Reservoir water temperature breakdown →
Minnesota DNR's Standard Survey on July 25, 2022 caught 3.00 walleye per gill net at Wellner-Hageman Reservoir. Length samples in the latest survey that recorded them ran 17–26 inches.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Wellner-Hageman Reservoir’s water-quality measurements separately, and the water-quality trend over 4 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
6 surveys on file from MN DNR Fisheries. Most recent: 2022-07-25 (Standard Survey).
6 surveys on file · most recent 2022-07-25 (Standard Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Yellow Perch | 52.57 | 5–8 in 2022-07-25 | 0.14 lb |
| Black Bullhead | 47.37 | 9–10 in 2016-06-13 | 0.37 lb |
| Black Crappie | 14.80 | 4–9 in 2022-07-25 | 0.26 lb |
| Bluegill | 14.02 | 4–8 in 2022-07-25 | 0.25 lb |
| White Sucker | 2.85 | 11–19 in 2022-07-25 | 1.81 lb |
| Walleye | 1.22 | 17–26 in 2022-07-25 | 3.21 lb |
CPUE = catch per unit effort, fish caught per net per set in a standardised survey. It measures abundance, not size, and is not a weekly bite report.
Length Distributions
Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.
Yellow Perch
Black Bullhead
Black Crappie
Bluegill
From the 2022-07-25 survey
Wellner-Hageman Reservoir (aka Mound Creek Reservoir), near Sanborn, is a man-made 70-acre lake located in Brown County. The class 33 reservoir was created in the spring of 1993 for flood and erosion control for Mound Creek and lower portions of the Cottonwood River. Wellner-Hageman Reservoir is within a large…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Wellner-Hageman Reservoir. 3 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — Wellner-Hageman ReservoirFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — Wellner-Hageman ReservoirFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — Wellner-Hageman ReservoirPublic Water Access Sites · MN DNR LakeFinder
Lake Details
Max depth
24 ft
Surface area
75 acres
Shoreline
3.5 mi
Public access
Yes
Listed by Minnesota PCA
Stays via Stay22
Stays near Wellner-Hageman Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Wellner-Hageman Reservoir 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Wellner-Hageman Reservoir are listed below.
Top-rated places to stay near Wellner-Hageman Reservoir
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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Fish Species
Click a species to see every lake where it is documented.
Fishing Wellner-Hageman Reservoir
- → Wellner-Hageman Reservoir fishing: DNR survey catch rates, species & stocking
- → Wellner-Hageman Reservoir fishing forecast & best times (species outlook + 14-day solunar calendar)
- → Wellner-Hageman Reservoir fishing regulations (limits, seasons, special rules)
- → Is it safe to eat fish from Wellner-Hageman Reservoir? (mercury & PFAS guide)
Water Quality Trend: Worsening
Based on 4 years of monitoring (2020–2023).
Water clarity
Worsening4 years
Phosphorus
Stable-0.6 µg/L/yr4 years
Chlorophyll-a
Worsening+3.12 µg/L/yr4 years
Reservoir Info (USACE NID)
Wellner-Hageman Reservoir is a man-made reservoir impounded by the Wellner-Hageman (completed 1993), built primarily for flood risk reduction on the Mound Creek, 52 ft tall and 2,200 ft long.
- Surface area
- 71 ac
- Normal storage
- 71 ac-ft
- Max storage
- 227 ac-ft
- Drainage area
- 13.1 sq mi
- Hazard class
- Low
- Owner
- County of Brown
Source: USACE National Inventory of Dams, NID ID MN01001 · Operator website
Nearby Lakes in Brown County
Frequently asked questions about Wellner-Hageman Reservoir
Where is Wellner-Hageman Reservoir?
- Wellner-Hageman Reservoir is a lake in Brown County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Wellner-Hageman Reservoir?
- Wellner-Hageman Reservoir in Brown County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 3.7 ft visibility. Phosphorus: 45 µg/L. Chlorophyll-a (algae): 30.3 µg/L. Maximum depth: 24 ft. Surface area: 74.92 acres.
Is Wellner-Hageman Reservoir 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 Wellner-Hageman Reservoir?
- Wellner-Hageman Reservoir typically sits around 53°F at the surface in October, from 236 EPA Water Quality Portal field readings (2017–2023). That is a typical value for the month, not a live reading.
How deep is Wellner-Hageman Reservoir?
- Wellner-Hageman Reservoir has a maximum depth of 24 feet. The lake covers 74.92 acres.
What fish are in Wellner-Hageman Reservoir?
- Fish species found in Wellner-Hageman Reservoir include black bullhead, black crappie, bluegill, common carp, green sunfish, largemouth bass, walleye, white sucker, yellow perch. Wellner-Hageman Reservoir is located in Brown County, Minnesota.
What did the DNR fisheries survey find at Wellner-Hageman Reservoir?
- Minnesota DNR's Standard Survey on July 25, 2022 caught 3.00 walleye per gill net at Wellner-Hageman Reservoir. Length samples in the latest survey that recorded them ran 17–26 inches. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Wellner-Hageman Reservoir’s water-quality measurements separately, and the water-quality trend over 4 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at Wellner-Hageman Reservoir?
- Public access to Wellner-Hageman Reservoir is listed as yes on the lake record. 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.
Explore Wellner-Hageman Reservoir across LakeQuality
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Where this data comes from
357 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA357 samples · 2020–2023
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidity, Nephelometric Method
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.
Other records on this page
Lake details from Minnesota DNR LakeFinder