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B

Pike Lake

Washington County, WisconsinMesotrophic

Pike Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. A maximum depth of 45 ft puts Pike Lake in the middle of Wisconsin's depth distribution. The lake's 461 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. Pike Lake ranks 7 of 15 in Washington County — solidly in the upper half of the local distribution.

Zebra mussel presence at Pike Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. Walleye are documented at Pike Lake, one of 5 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. 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 2025-10-14. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Moderate clarity, visible to about 7 ft. Phosphorus level: 19.3 µg/L. Trophic State Index: 48.

MetricValueGrade
Water Clarity (Secchi Depth)7 ftC
Phosphorus19.3 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)48Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth45 ft
Surface Area461 acres
Public AccessYes

Fish Species

Click a species to see every graded lake where it is documented.

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

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

Pike 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.

Banded Mystery SnailCurly-Leaf PondweedEurasian Water-MilfoilHybrid Eurasian / Northern Water-MilfoilRusty CrayfishZebra MusselStarry Stonewort

Water Quality Trend: Stable

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.443 m/yr6
Phosphorus Improving-0.68 µg/L/yr6
See year-by-year chart →

Recreation & Access

3
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #7 of 15 lakes in Washington County

Cleaner Lakes Within 30 Miles

Pike Lake holds Grade B. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Washington County

Mesotrophic Lakes in Wisconsin

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1986. 1 station on file (most recent sample 2025).

DNR Assessment
Good · Deep Lowland lake
Trophic State Index 49 (mesotrophic) · 5-year average

Fish Species (DNR-rated)

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

Reservoir Info (USACE NID)

Pike Lake is a man-made reservoir impounded by the Pike Lake (completed 1870), built primarily for recreation on the TRIB. RUBICON RIVER; gravity-type dam, 12 ft tall and 200 ft long.

Surface area
522 ac
Normal storage
1,040 ac-ft
Max storage
5,740 ac-ft
Drainage area
13 sq mi
Hazard class
Low
Owner
Pike Lake Advancement Association

Source: USACE National Inventory of Dams, NID ID WI00662 · Operator website

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

Public boat-access points from the USGS National Boat Ramps inventory

Most recent sample: 2025-10-14

Monitoring stations: 1

Where to stay near Pike Lake

Compare lakeside cabins, hotels, and vacation rentals near Pike Lake in Washington County, Wisconsin — live availability and prices for your trip.

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