Skip to main content
LakeQuality
C

Spur Lake

Oneida County, WisconsinMesotrophic

Spur Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

A TSI near 50 places Spur Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's 113 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 the 140 graded lakes of Oneida County, Spur Lake sits at rank 128, near the bottom of the county list.

Spur Lake has at least one documented invasive species (Purple Loosestrife), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. The lake's fish records list 2 species — a varied community without one dominant gamefish. 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 2025-08-19. Grade methodology: LakeGrade methodology.

Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 6.6 ft. Phosphorus level: 22.7 µg/L. Trophic State Index: 50.

MetricValueGrade
Water Clarity (Secchi Depth)6.6 ftD
Phosphorus22.7 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)50Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Surface Area113 acres

Fish Species

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

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

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

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

Invasive Species

Purple Loosestrife

Water Quality Trend: Declining

Based on 7 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.059 m/yr6
Phosphorus Declining+1.2 µg/L/yr6
See year-by-year chart →

Location

Loading map…

County Ranking

Ranked #128 of 140 lakes in Oneida County

Cleaner Lakes Within 30 Miles

Spur Lake holds Grade C. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Oneida County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2019. 2 stations on file (most recent sample 2025).

DNR Assessment
Excellent · Shallow Headwater lake
Trophic State Index 43 (mesotrophic) · 5-year average

Fish Species (DNR-rated)

Panfish(Common)Northern Pike(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: 2025-08-19

Monitoring stations: 3