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LakeQuality
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Silver Lake

Forest County, WisconsinOligotrophic

On the LakeGrade rubric, Silver Lake pulls an A: clarity at 42.7 ft and 12 µg/L of phosphorus put it in the top bracket for Wisconsin. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

Trophically, Silver Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's 317 acres and partial shoreline records put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Within Forest County's 35 graded waters, Silver Lake sits at rank 1, near the top of the local distribution.

Eurasian watermilfoil has been documented at Silver Lake, requiring shoreline management to keep dense mats from crowding native vegetation. The fishery includes walleye alongside the lake's other 6 documented species — a notable draw for Wisconsin anglers. Public access is available — the lake is on the Wisconsin DNR public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-29. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 42.7 ft down. Phosphorus level: 11.5 µg/L. Trophic State Index: 31.

MetricValueGrade
Water Clarity (Secchi Depth)42.7 ftA
Phosphorus11.5 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)31Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Surface Area317 acres
Public AccessYes

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

→ Best fishing times for Silver Lake (14-day solunar calendar)

→ Is it safe to eat fish from Silver Lake? (mercury & PFAS guide)

Silver Lake fishing regulations (limits, seasons, special rules)

Invasive Species

Banded Mystery SnailChinese Mystery SnailEurasian Water-MilfoilRusty Crayfish

Water Quality Trend: Improving

Based on 4 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+1.5 m/yr3
Phosphorus Stable0 µg/L/yr3

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #1 of 35 lakes in Forest County

Nearby Lakes in Forest County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1992. 4 stations on file (most recent sample 2025).

DNR Assessment
Excellent · Shallow Seepage lake
Trophic State Index 42 (mesotrophic) · 5-year average

Fish Species (DNR-rated)

Panfish(Abundant)Musky(Common)Largemouth Bass(Common)Smallmouth Bass(Common)Northern Pike(Present)Walleye(Present)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Fish and recreation data from Wisconsin DNR Lakes

Most recent sample: 2025-08-29

Monitoring stations: 1