What is the water quality grade for Lake Tishomingo Nr. Dam?

Lake Tishomingo Nr. Dam in Jefferson County, Wisconsin received a water quality grade of C (Fair). Water clarity: 5.4 ft visibility. Phosphorus: 23.5 µg/L. Chlorophyll-a (algae): 7.1 µg/L. Surface area: 120 acres.

Is Lake Tishomingo Nr. Dam safe to swim in?

Generally safe for swimming, moderate water quality. Lake Tishomingo Nr. Dam has an overall water quality grade of C. Algae concentration (chlorophyll-a) is 7.1 µg/L. Always check local health department advisories before swimming.

Lake Tishomingo Nr. Dam

Jefferson County, WisconsinEutrophic

Lake Tishomingo Nr. Dam is a 120-acre productive, nutrient-rich eutrophic lake in Jefferson County, MO. Water quality is graded C based on 3 sampling years through 2024. Compared to the 6 other monitored lakes in Jefferson County, Lake Tishomingo Nr. Dam ranks #5 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-08-13. Grade methodology: LakeGrade methodology.

Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 5.4 ft. Phosphorus level: 23.5 µg/L. Chlorophyll-a: 7.1 µg/L. Trophic State Index: 51.

Metric	Value	Grade
Water Clarity (Secchi Depth)	5.4 ft	D
Phosphorus	23.5 µg/L	B
Chlorophyll-a (Algae)	7.1 µg/L	B
Trophic State Index (TSI)	51	Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

Characteristic	Value
Surface Area	120 acres

Location

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County Ranking

Ranked #5 of 7 lakes in Jefferson County

Cleaner Lakes Within 30 Miles

Lake Tishomingo Nr. Dam holds Grade C. 4 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Jefferson County

Lake Wauwanoka Nr. Dam

More Wisconsin Lake Rankings

Cleanest lakes in Wisconsin

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

All Wisconsin lakes

Full state directory

Other Grade C Lakes in Wisconsin

Aspen Lake Along Southern Arm

Warren County · Clarity: 3.8 ft

Mark Twain Lake by Hwy J

Ralls County · Clarity: 3.7 ft

Red Fox Lake

Warren County · Clarity: 3.3 ft

Waukomis Lake

Platte County · Clarity: 4.7 ft

Table Rock L. Nr. Greens Hollow Lake

Barry County · Clarity: 5 ft

Little Prairie Lake by Dam

Phelps County · Clarity: 4.9 ft

Eutrophic Lakes in Wisconsin

Aspen Lake Along Southern Arm Boathouse Lake Hunnewell Lake Long Branch Lk. Lake

Reservoir Info (USACE NID)

Lake Tishomingo Nr. Dam is a man-made reservoir impounded by the Lake Tishomingo Dam (completed 1950), built primarily for recreation on the TRIBUTARY TO BELEW CREEK; earth-type dam, 68 ft tall and 870 ft long.

Surface area: 120 ac
Normal storage: 2,376 ac-ft
Max storage: 3,128 ac-ft
Drainage area: 2.97 sq mi
Hazard class: High
Owner: LAKE TISHOMINGO POA

Source: USACE National Inventory of Dams, NID ID MO30039 · Operator website · Matched by proximity (0.14 km)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2024-08-13

Monitoring stations: 1