Langdon Lake
Hennepin County, Minnesota143 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Langdon Lake. Here is what has been measured.
- Impaired · Nutrients (phosphorus, nitrogen)
- Eurasian watermilfoil
- 38 ft max depth
- Public access
- Limited data
Langdon Lake in Hennepin County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 1.5 ft visibility. Maximum depth: 38 ft. Surface area: 143.34 acres.
Minnesota DNR's Standard Survey on July 6, 1993 caught 94.50 black bullhead per gill net at Langdon Lake. Length samples in the latest survey that recorded them ran 4–11 inches. DNR survey details →
Langdon Lake is a 143-acre lake in Hennepin County, Minnesota with a maximum depth of 38 feet. Overall water quality is improving over recent sampling years. The lake supports 8 documented fish species including black bullhead, black crappie, and bluegill. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-11-23. Methodology: how these readings are compared.
Langdon Lake covers about 140 acres in Hennepin County. It has one public boat landing. The median ice-out date is March 31, which is when the open-water season begins. If you are planning to stay, you can search lake houses and cabins around Langdon Lake on Vrbo, or look for a hotel room near the lake on Booking.com or Expedia.
What Langdon Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing8 species recorded
- Ice seasonIce-out around Mar 31
- Deep water38 ft surveyed max depth
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Langdon Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Langdon 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 Langdon Lake
These are the measurements Minnesota PCA publishes for Langdon Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.5 ft of visibility. TSI 71.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.5ft | 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. | 71 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Langdon Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Langdon Lake typically sits around 55°F at the surface in October. Summer average is about 67°F. Usually warmest in Jul (about 70°F) and coldest in Mar (about 41°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (41°F) to its warmest (70°F).
Typical surface water temperature by month, from 325 field readings (2010–2024) via the EPA Water Quality Portal. See the full Langdon Lake water temperature breakdown →
Minnesota DNR's Standard Survey on July 6, 1993 caught 94.50 black bullhead per gill net at Langdon Lake. Length samples in the latest survey that recorded them ran 4–11 inches.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Langdon Lake’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
2 surveys on file from MN DNR Fisheries. Most recent: 1993-07-06 (Standard Survey).
2 surveys on file · most recent 1993-07-06 (Standard Survey)
33 years old| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Fathead Minnow | 622.33 | ||
| Black Bullhead | 120.59 | 4–11 in 1993-07-06 | 0.83 lb |
| Northern Pike | 7.70 | 2.75 lb | |
| Bluegill | 4.55 | 1–7 in 1993-07-06 | 0.16 lb |
| Green Sunfish | 3.43 | 2–5 in 1993-07-06 | 0.14 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.
Black Bullhead
Bluegill
Green Sunfish
From the 1993-07-06 survey
Black bullhead are by far the most common species found in Langdon lake. Their population is considered high for lake class 38, and they are of above average weight. Green sunfish were also found to be very abundant, but are mainly 3.5 to 5 inches in length. Bluegill numbers are average for this lake class. Of 79 fish…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Langdon Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — LangdonFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
38 ft
Surface area
143 acres
Shoreline
2.1 mi
Littoral zone
58%
Share shallower than 15 ft
Public access
Yes
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Elevation
919 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Lake Minnetonka, Mounds Bay ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Langdon Lake
Compare lakeside cabins, hotels, and vacation rentals near Langdon Lake in Hennepin 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 Langdon Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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 →
Follow Langdon Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fish Species
Click a species to see every lake where it is documented.
Fishing Langdon Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: Improving
Based on 6 years of monitoring (2020–2025).
Water clarity
Improving6 years
Ice season
Typical ice-out
Mar 31
Earliest Mar 7, 2017 · Latest Apr 14, 2023
Typical ice-in
Nov 23
Earliest Nov 19, 2022 · Latest Nov 30, 2024
Most recent ice-out
Apr 14
2023
8 observations · Minnesota PCA ice records
EPA Impairment Status
Langdon 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: Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN27-0182-00 · Official waterbody report
Nearby Lakes in Hennepin County
Frequently asked questions about Langdon Lake
Where is Langdon Lake?
- Langdon Lake is a lake in Hennepin County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Langdon Lake?
- Langdon Lake in Hennepin County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 1.5 ft visibility. Maximum depth: 38 ft. Surface area: 143.34 acres.
Is Langdon Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Langdon Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Langdon Lake?
- Langdon Lake typically sits around 55°F at the surface in October, from 325 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
How deep is Langdon Lake?
- Langdon Lake has a maximum depth of 38 feet. The lake covers 143.34 acres.
What fish are in Langdon Lake?
- Fish species found in Langdon Lake include black bullhead, black crappie, bluegill, brown bullhead, green sunfish, hybrid sunfish, pumpkinseed, yellow bullhead. Langdon Lake is located in Hennepin County, Minnesota.
What did the DNR fisheries survey find at Langdon Lake?
- Minnesota DNR's Standard Survey on July 6, 1993 caught 94.50 black bullhead per gill net at Langdon Lake. Length samples in the latest survey that recorded them ran 4–11 inches. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Langdon Lake’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
When does Langdon Lake thaw?
- Langdon Lake typically has ice-out around Mar 31. Ice typically forms around Nov 23. The open water season is approximately 237 days.
Are there boat ramps on Langdon Lake?
- Langdon Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Minnetonka, Mounds Bay Park. Public access is listed as yes.
Can I fish at Langdon Lake?
- Langdon 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 Langdon Lake across LakeQuality
Fish species and the cleanest lakes across Minnesota
Fish species and best lakes in Hennepin County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its readings
Lakes in the Crow River Watershed, ranked by water quality
Minnesota's cleanest lakes, ranked on agency measurements
More lakes in Minnesota
State Parks Near Langdon Lake
Other Lakes in Minnesota
Hypereutrophic Lakes in Minnesota
Where this data comes from
182 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA182 samples · 2020–2024
Analytical methods
- Field measurement/observation, generic 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
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
Ice data from Minnesota DNR Climate