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LakeQuality
B

Toad Lake

Becker County, MinnesotaEutrophic

Toad Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

At a TSI of 50, Toad Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. Toad Lake reaches 29 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 1,715 acres, Toad Lake is one of the larger lakes in Becker County, with 10.2 miles of shoreline supporting multiple distinct use patterns. Toad Lake sits at rank 59 of 93 in Becker County, in the lower half of the local distribution.

Zebra mussels have been documented at Toad Lake, which alters the filter-feeding balance and can paradoxically increase water clarity while disrupting the food web. The fishery includes walleye alongside the lake's other 15 documented species — a notable draw for Minnesota anglers. A documented public access point at Toad Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 14 observed ice-outs, centered near Apr 25. 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, Minnesota DNR LakeFinder, last sampled 2024-09-16. Grade methodology: LakeGrade methodology.

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: 27 µg/L. Trophic State Index: 50.

MetricValueGrade
Water Clarity (Secchi Depth)7 ftC
Phosphorus27 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)50Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth29 ft
Average Depth21 ft
Surface Area1.7K acres
Shoreline Length10.2 mi
Littoral Zone33%
Public AccessYes

Fish Species

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

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

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

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

Invasive Species

zebra mussel

Water Quality Trend: Improving

Based on 5 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.13 m/yr5
Phosphorus Stable0 µg/L/yr5

Ice Season

Historical ice data from Minnesota DNR (20 observations).

Typical Ice-Out
Apr 25
Typical Ice-In
Nov 14

Estimated open water season: 203 days

EarliestLatest
Ice-Out2012-03-23 (2012)2013-05-13 (2013)
Ice-In2003-11-08 (2003)2001-12-12 (2001)

Most recent ice-out: 2021-04-05

Location

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County Ranking

Ranked #59 of 93 lakes in Becker County

Nearby Lakes in Becker County

DNR Fisheries Survey Summary

12 surveys on file from MN DNR Fisheries. Most recent: 2021-08-09 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
MMS195.50
CSH42.86
Bluntnose Minnow29.98
Bluegill25.410.17 lb
Yellow Bass10.760.78 lb
Yellow Perch10.050.13 lb

CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.

Length Distributions

Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.

Bluegill

207 fish · 38 in · 2021-08-09
69350345678

Yellow Bass

145 fish · 814 in · 2021-08-09
58290891011121314

Yellow Perch

15 fish · 56 in · 2021-08-09
105056

From the 2021-08-09 survey

Toad (also referred to as Big Toad) Lake is a 1,715-acre lake located in central Becker County, 21 miles east of the city of Detroit Lakes. The shoreline of the lake is moderately developed, primarily along its northern and southwestern shores. The Toad Lake Aquatic Management Area (AMA) protects 115.1 acres of land…

Source: MN DNR LakeFinder Fisheries Lake Survey

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Toad Lake. 4 reports on file.

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Ice data from Minnesota DNR Climate

Most recent sample: 2024-09-16

Monitoring stations: 3