Langdon Lake
Langdon Lake in Hennepin County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.5 ft visibility. Maximum depth: 38 ft. Surface area: 143.34 acres.
- Clarity
- 1.5 ft
- Typical in August
- 68°F
- Max depth
- 38 ft
- Area
- 143 acres
- Trend
- ↑ Improving
- Public access
- Yes
- Ice-out
- Mar 31
- Open water
- 237 days
Next lake in Hennepin County
Why Langdon 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 Langdon Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not 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.
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 2 public boat landings.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-11-23. 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 Langdon Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.5 ft of visibility. Trophic State Index: 71.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay 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
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Planning a whole trip? See where to stay at Minnesota’s top lakes →
Water Temperature
Langdon Lake typically sits around 68°F at the surface in August. 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.
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 →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 38 ft |
| Surface Area | 143 acres |
| Shoreline Length | 2.1 mi |
| Littoral Zone | 58% |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Lake Minnetonka, Phelp'sPublic
- Lake Minnetonka, Mounds Bay ParkPublic
Fish Species
Click a species to see every graded 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.
DNR Fisheries Survey Summary
2 surveys on file from MN DNR Fisheries. Most recent: 1993-07-06 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Fathead Minnow | 622.33 | — |
| Black Bullhead | 120.59 | 0.83 lb |
| BST | 36.33 | — |
| Northern Pike | 7.70 | 2.75 lb |
| Bluegill | 4.55 | 0.16 lb |
| Green Sunfish | 3.43 | 0.14 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
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
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.131 m/yr | 6 |
Ice Season
Historical ice data from Minnesota DNR (8 observations).
Estimated open water season: 237 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2017-03-07 (2017) | 2023-04-14 (2023) |
| Ice-In | 2022-11-19 (2022) | 2024-11-30 (2024) |
Most recent ice-out: 2023-04-14
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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN27-0182-00 · Official waterbody report
Graded lakes near Langdon Lake
Langdon Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Hennepin County
Frequently asked questions about Langdon Lake
What is the water quality grade for Langdon Lake?
- Langdon Lake in Hennepin County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.5 ft visibility. Maximum depth: 38 ft. Surface area: 143.34 acres.
Is Langdon Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Langdon Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What is the water temperature of Langdon Lake?
- Langdon Lake typically sits around 68°F at the surface in August, 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.
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 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Lake Minnetonka, Phelp's, Lake Minnetonka, Mounds Bay Park. Public access is listed as yes.
Explore Langdon Lake across LakeGrade
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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)
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
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