Tilleda Off Bridge Lake
Shawano County, WisconsinHypereutrophic
On the LakeGrade rubric Tilleda Off Bridge Lake fails the cutoffs — a TSI of 91 and persistent algal pressure put it in the bottom tier. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.
The hypereutrophic status — TSI 91 — reflects sustained heavy nutrient loading from the surrounding watershed and frequent algal pressure. At only 11 ft deep, Tilleda Off Bridge Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. At 28 acres, Tilleda Off Bridge Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Within the 27 graded lakes of Shawano County, Tilleda Off Bridge Lake sits at rank 27, near the bottom of the county list.
Eurasian watermilfoil is established at Tilleda Off Bridge Lake, which can dampen recreational access and pressure the native plant community. Bass fishing is part of the appeal: the species list runs to 3, anchored by largemouth and/or smallmouth bass. 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, Wisconsin DNR Surface Water, last sampled 2023-05-18. 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 0.5 ft of visibility. Phosphorus level: 525 µg/L. Trophic State Index: 91.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.5 ft | F |
| Phosphorus | 525 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 91 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 11 ft |
| Surface Area | 28 acres |
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Tilleda Off Bridge Lake (14-day solunar calendar)
→ Is it safe to eat fish from Tilleda Off Bridge Lake? (mercury & PFAS guide)
→ Tilleda Off Bridge Lake fishing regulations (limits, seasons, special rules)
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Location
County Ranking
Ranked #27 of 27 lakes in Shawano County
Cleaner Lakes Within 30 Miles
Tilleda Off Bridge Lake holds Grade F. 5 nearby lakes hold higher grades.
- AMission LakeShawano County · mi · Two grade letters higher (F → A)
- ASams LakeShawano County · mi · Two grade letters higher (F → A)
- AMalone LakeShawano County · mi · Two grade letters higher (F → A)
- BUnknown LakeShawano County · mi · Two grade letters higher (F → B)
- CUpper Red LakeShawano County · mi · Two grade letters higher (F → C)
Nearby Lakes in Shawano County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Hypereutrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 3 stations on file (most recent sample 2023).
Fish Species (DNR-rated)
Reservoir Info (USACE NID)
Tilleda Off Bridge Lake is a man-made reservoir impounded by the Tilleda (completed 1910), built primarily for recreation on the NORTH BRANCH EMBARRASS; gravity-type dam, 17 ft tall and 82 ft long.
- Surface area
- 28 ac
- Normal storage
- 133 ac-ft
- Max storage
- 160 ac-ft
- Drainage area
- 70.5 sq mi
- Hazard class
- High
- Owner
- TILLEDA POND REHABILITATION DISTRICT
Source: USACE National Inventory of Dams, NID ID WI00203 · Operator website · Matched by proximity (0.11 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-05-18
Monitoring stations: 1