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F

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.

Reviewed by LakeQuality Editorial Team · Updated

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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.

MetricValueGrade
Water Clarity (Secchi Depth)1.6 ftF
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)70Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Surface Area530 acres
Public AccessNo

Location

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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.

Nearby Lakes in Hennepin County

Compare Long Meadow Lake With Nearby Lakes

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