Hennepin Lake
Hubbard County, Minnesota418 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Hennepin Lake. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
- 14 ft max depth
- Public access
- Limited data
Hennepin Lake in Hubbard County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 10 ft visibility. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 4.8 µg/L. Maximum depth: 14 ft. Surface area: 417.61 acres.
Minnesota DNR's Standard Survey on May 29, 2013 caught 0.43 walleye per gill net at Hennepin Lake. DNR survey details →
Hennepin Lake is a 418-acre mesotrophic lake in Hubbard County, Minnesota with a maximum depth of 14 feet. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 67 other monitored lakes in Hubbard County, Hennepin Lake ranks #53 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-09-23. Methodology: how these readings are compared.
Hennepin Lake covers about 420 acres in Hubbard County. It has one public boat landing. Vrbo is where to look for cabins and lake homes around Hennepin Lake, and Booking.com and Expedia search hotels near the lake for your dates.
What Hennepin Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10 ft of visibility
- Boat launch1 documented ramp
Swimming conditions
Readings onlyLimited data
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. Hennepin Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Hennepin 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 Hennepin Lake
These are the measurements Minnesota PCA publishes for Hennepin 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 10 ft. Phosphorus 15 µg/L. Chlorophyll-a 4.8 µg/L. TSI 44.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 10ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 15µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 4.8µg/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. | 44 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Hennepin Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Hennepin Lake typically sits around 66°F at the surface in September. Summer average is about 73°F. Usually warmest in Jul (about 76°F) and coldest in May (about 60°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (60°F) to its warmest (76°F).
Typical surface water temperature by month, from 28 field readings (2024–2024) via the EPA Water Quality Portal. See the full Hennepin Lake water temperature breakdown →
Minnesota DNR's Standard Survey on May 29, 2013 caught 0.43 walleye per gill net at Hennepin Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Hennepin Lake’s water-quality measurements separately. 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: 2013-05-29 (Standard Survey).
6 surveys on file · most recent 2013-05-29 (Standard Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Brown Bullhead | 19.54 | 7–11 in 2013-05-29 | 0.26 lb |
| Bluegill | 17.29 | 3–7 in 2013-05-29 | 0.15 lb |
| Yellow Perch | 8.84 | 5–11 in 2013-05-29 | 0.23 lb |
| Northern Pike | 7.08 | 11–32 in 2013-05-29 | 1.59 lb |
| Pumpkinseed | 6.84 | 3–7 in 2013-05-29 | 0.14 lb |
| Black Crappie | 3.93 | 4–11 in 2013-05-29 | 0.3 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.
Brown Bullhead
Bluegill
Yellow Perch
Northern Pike
From the 2013-05-29 survey
Hennepin Lake is located 2 miles southeast of Becida in northwestern Hubbard County. Hennepin has a surface area of 418 acres and a maximum depth of 14 feet. A public access is located on the western shore of the lake, off of 470th street. The Minnesota Department of Natural Resources (DNR) has classified Minnesota's…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Hennepin Lake. 4 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — HennepinFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Hennepin (1280)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — HennepinFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — HennepinPublic Water Access Sites · MN DNR LakeFinder
Lake Details
Max depth
14 ft
Surface area
418 acres
Shoreline
5.5 mi
Littoral zone
100%
Share shallower than 15 ft
Public access
Yes
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
7 sq mi
HydroLAKES / HydroSHEDS
Elevation
1,424 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Hennepin LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Hennepin Lake
Compare lakeside cabins, hotels, and vacation rentals near Hennepin Lake in Hubbard 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 Hennepin Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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Follow Hennepin Lake’s readings
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Fishing Hennepin Lake
EPA Impairment Status
Hennepin Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN29-0246-00 · Official waterbody report
Nearby Lakes in Hubbard County
Frequently asked questions about Hennepin Lake
Where is Hennepin Lake?
- Hennepin Lake is a lake in Hubbard County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Hennepin Lake?
- Hennepin Lake in Hubbard County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 10 ft visibility. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 4.8 µg/L. Maximum depth: 14 ft. Surface area: 417.61 acres.
Is Hennepin Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Hennepin Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
What is the water temperature of Hennepin Lake?
- Hennepin Lake typically sits around 66°F at the surface in September, from 28 EPA Water Quality Portal field readings (2024–2024). That is a typical value for the month, not a live reading.
How deep is Hennepin Lake?
- Hennepin Lake has a maximum depth of 14 feet. The lake covers 417.61 acres.
What did the DNR fisheries survey find at Hennepin Lake?
- Minnesota DNR's Standard Survey on May 29, 2013 caught 0.43 walleye per gill net at Hennepin Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Hennepin Lake’s water-quality measurements separately. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Hennepin Lake?
- Hennepin Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Hennepin Lake. Public access is listed as yes.
Can I fish at Hennepin Lake?
- Hennepin Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. 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 Hennepin Lake across LakeQuality
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Where this data comes from
38 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA38 samples · 2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory