What is the water quality grade for Lancelot Lake Southwest Basin?

Lancelot Lake Southwest Basin in Gladwin County, Wisconsin received a water quality grade of B (Good). Water clarity: 10 ft visibility. Chlorophyll-a (algae): 6.2 µg/L. Surface area: 250 acres.

Is Lancelot Lake Southwest Basin safe to swim in?

Good for swimming, clear water with low algae levels. Lancelot Lake Southwest Basin has an overall water quality grade of B. Algae concentration (chlorophyll-a) is 6.2 µg/L. Always check local health department advisories before swimming.

Lancelot Lake Southwest Basin

Gladwin County, WisconsinMesotrophic

Lancelot Lake Southwest Basin is a 250-acre mesotrophic lake in Gladwin County, MI. Water quality is graded B based on 2 sampling years through 2023. Compared to the 8 other monitored lakes in Gladwin County, Lancelot Lake Southwest Basin ranks #4 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-09-10. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 10 ft. Chlorophyll-a: 6.2 µg/L. Trophic State Index: 46.

Metric	Value	Grade
Water Clarity (Secchi Depth)	10 ft	B
Phosphorus	No data
Chlorophyll-a (Algae)	6.2 µg/L	B
Trophic State Index (TSI)	46	Mesotrophic

Moderate nutrients, good water quality

Lake Details

Characteristic	Value
Surface Area	250 acres

Location

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County Ranking

Ranked #4 of 9 lakes in Gladwin County

Cleaner Lakes Within 30 Miles

Lancelot Lake Southwest Basin holds Grade B. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Gladwin County

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Top 25 by overall water quality score

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Grade A/B + low algae filter

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Panfish-rich, public access

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Other Grade B Lakes in Wisconsin

Middle Lake; Elba Township; Section 13

Lapeer County · Clarity: 9.5 ft

Portage Lake

Livingston County · Clarity: 13 ft

Bear Lake East Basin; Pleasanton Township

Manistee County · Clarity: 11 ft

Bass Lake

Lake County · Clarity: 14 ft

Long Lake

Cass County · Clarity: 10.5 ft

Byram Lake West Central Basin; Fenton Township

Genesee County · Clarity: 10 ft

Mesotrophic Lakes in Wisconsin

Middle Lake; Elba Township; Section 13 Portage Lake Shavehead Lake East Basin; Porter Township Chippewa Lake Northeast Basin; Chippewa Township

Reservoir Info (USACE NID)

Lancelot Lake Southwest Basin is a man-made reservoir impounded by the Lake Lancelot Dam (completed 1976), built primarily for recreation on the Tributary to Sugar River; earth-type dam, 17 ft tall and 1,400 ft long.

Surface area: 250 ac
Normal storage: 1,950 ac-ft
Max storage: 2,100 ac-ft
Drainage area: 4.9 sq mi
Hazard class: Low
Owner: Gladwin County Drain Commissioner

Source: USACE National Inventory of Dams, NID ID MI00488 · Operator website · Matched by proximity (0.64 km)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2023-09-10

Monitoring stations: 1