Long Meadow Lake
Hennepin County, MinnesotaLimited DataEutrophic
Long Meadow Lake earns an F: phosphorus readings still being added and clarity at 1.6 ft signal heavy nutrient loading from the surrounding watershed.
Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. Long Meadow Lake covers 530 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Long Meadow Lake ranks 93 of 95 in Hennepin County — at the lower end of the locally monitored distribution.
Long Meadow Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Long Meadow Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2023-09-06. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.6 ft of visibility. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 70 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 530 acres |
| Public Access | No |
Location
County Ranking
Ranked #93 of 95 lakes in Hennepin County
Cleaner Lakes Within 30 Miles
Long Meadow Lake holds Grade F. 5 nearby lakes hold higher grades.
- BBlackhawk LakeDakota County · mi · Two grade letters higher (F → B)
- BLemay LakeDakota County · mi · Two grade letters higher (F → B)
- CFish LakeDakota County · mi · Two grade letters higher (F → C)
- CThomas LakeDakota County · mi · Two grade letters higher (F → C)
- CPitts LakeDakota County · mi · Two grade letters higher (F → C)
Nearby Lakes in Hennepin County
More Minnesota Lake Rankings
State Parks Near Long Meadow Lake
Other Grade F Lakes in Minnesota
Eutrophic Lakes in Minnesota
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Reservoir Info (USACE NID)
Long Meadow Lake is a man-made reservoir impounded by the Black Dog Lake (completed 1953), built primarily for water supply on the Minnesota River-TR; gravity-type dam, 25 ft tall and 120 ft long.
- Surface area
- 530 ac
- Normal storage
- 1,618 ac-ft
- Max storage
- 3,550 ac-ft
- Drainage area
- 3 sq mi
- Hazard class
- Low
- Owner
- Xcel Energy
Source: USACE National Inventory of Dams, NID ID MN00349 · Operator website · Matched by proximity (0.83 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Lake details from Minnesota DNR LakeFinder
Most recent sample: 2023-09-06
Monitoring stations: 1