7 miles southwest of Longville
Cass County, Minnesota · 46.9087° N, 94.3046° W
Directions to Black Water Lake Public Water Access SiteApple Maps
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Updated 19 Oct 2026, 5:52 pm EDT.
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Minnesota DNR lake survey, fetched 15 Oct 2026. Not for navigation.
1 public access site on Blackwater Lake.
Minnesota DNR public water accesses, fetched 15 Oct 2026.
Minnesota DNR stocking reports list 7 stockings of Blackwater Lake in 6 of the years 2016 to 2024. The most recent, in 2024, included 3,696 walleye fingerlings. Species stocked: walleye.
Latest: 2024: 1,106 walleye fingerlings.
Source: Minnesota DNR Fisheries (LakeFinder stocking reports), fetched 15 Oct 2026. How we measure
Measured from Minnesota DNR contours. How we measure
Minnesota DNR’s latest standard fish survey of Blackwater Lake was in July 2023: 12 gill nets and 11 trap nets caught 15 species.
Walleye per gill net, standard surveys: 2008 3.9 · 2011 3.8 · 2015 3.2 · 2019 1.9 · 2023 2.0
Bluegill per trap net, standard surveys: 2008 34 · 2011 9.7 · 2015 23 · 2019 24 · 2023 7.5
Walleye: 26 measured, 8 to 27 in, half 19 in or longer; average 2.6 lb, above normal (normal 1.2–2.4 lb).
Northern pike: 118 measured, 10 to 35 in, half 21 in or longer; average 2.3 lb, normal (normal 1.5–2.7 lb).
Largemouth bass: 160 measured, 5 to 17 in, half 9 in or longer; average 0.8 lb, normal (normal 0.5–1.1 lb).
Smallmouth bass: 16 measured, 4 to 20 in, half 13 in or longer; average 2.4 lb, above normal (normal 0.7–1.9 lb).
Black crappie: 16 measured, 3 to 12 in, half 8 in or longer; average 0.42 lb, above normal (normal 0.2–0.4 lb).
Also caught: bowfin (dogfish), brown bullhead, hybrid sunfish, tullibee (cisco), white sucker, yellow bullhead.
Source: Minnesota DNR Fisheries lake survey, 17 Jul 2023, via LakeFinder, fetched 15 Oct 2026. Normal range: DNR’s range for lakes of the same class (43 classes, grouped by water chemistry and shape). Each line has its own scale. How we measure
Measured water clarity averages about 12 ft: the Secchi depth across 5 readings, 2008–2023.
Minnesota Pollution Control Agency and volunteer Secchi readings, via Minnesota DNR LakeFinder, fetched 15 Oct 2026.
Minnesota DNR lake survey; straight-line miles.
Blackwater Lake is 67 feet at its deepest point, measured by Minnesota DNR survey. It covers 771 acres.
Yes. 1 public access site is listed: Black Water Lake Public Water Access Site.
Yes. Minnesota DNR stocking reports list 7 stockings of it in 6 of the years 2016 to 2024. The most recent, in 2024, included 3,696 walleye fingerlings.
Minnesota DNR’s July 2023 standard survey caught 15 species, most often northern pike, bluegill, pumpkinseed and rock bass.
About 60% of the lake's area is deeper than 10 feet, measured from Minnesota DNR depth contours.