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B

Two Inlets Lake

Becker County, MinnesotaMesotrophic

On the LakeGrade scale Two Inlets Lake grades a B, with clarity at 9.5 ft and 14 µg/L of phosphorus placing it above the Minnesota median. 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 Minnesota lakes fall. The lake's 60 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. The lake's 578 acres and 7.3 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Among the 93 graded lakes in Becker County, Two Inlets Lake sits at rank 42, above the county median.

No invasive species are currently listed at Two Inlets Lake — the lake remains off the Minnesota infested-waters roster. The fishery includes walleye among the lake's 15 documented species — a notable draw for Minnesota anglers. A documented public access point at Two Inlets Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 13 times at Two Inlets Lake, with a median around Apr 24. 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 2024-09-09. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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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 9.5 ft. Phosphorus level: 14 µg/L. Trophic State Index: 43.

MetricValueGrade
Water Clarity (Secchi Depth)9.5 ftC
Phosphorus14 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)43Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth60 ft
Average Depth23 ft
Surface Area577.98 acres
Shoreline Length7.3 mi
Littoral Zone29%
Public AccessYes

Fish Species

black crappie,bluegill,brown bullhead,greater redhorse,hybrid sunfish,largemouth bass,northern pike,pumpkinseed,rock bass,shorthead redhorse,tullibee (cisco),walleye,white sucker,yellow bullhead,yellow perch

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

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

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

Two Inlets Lake fishing regulations (limits, seasons, special rules)

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.149 m/yr5
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (23 observations).

Typical Ice-Out
Apr 24
Typical Ice-In
Nov 16

Estimated open water season: 206 days

EarliestLatest
Ice-Out2012-03-27 (2012)2013-05-12 (2013)
Ice-In2006-10-31 (2006)2015-11-27 (2015)

Most recent ice-out: 2016-04-02

Location

Loading map…

County Ranking

Ranked #42 of 93 lakes in Becker County

Cleaner Lakes Within 30 Miles

Two Inlets Lake holds Grade B. 5 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Becker County

DNR Fisheries Survey Summary

12 surveys on file from MN DNR Fisheries. Most recent: 2021-08-02 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Yellow Perch30.180.11 lb
BMS24.63
CSH21.780.03 lb
CRC20.11
Bluntnose Minnow11.01
CNM8.33

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.

Yellow Perch

484 fish · 210 in · 2021-08-02
20910502345678910

CSH

32 fish · 35 in · 2021-08-02
20100345

From the 2021-08-02 survey

Two Inlets Lake is located south of Two Inlets, MN in eastern Becker County. Two Inlets has a surface area of 578 acres and a maximum depth of 60 feet. There is a state-owned public access located on the northwest shore of the lake. Two Inlets provides fishing opportunities for Walleye, Northern Pike, Largemouth Bass,…

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 Two Inlets Lake. 4 reports on file.

Reservoir Info (USACE NID)

Two Inlets Lake is a man-made reservoir impounded by the Two Inlets Lake (completed 1938), built primarily for recreation on the Hay Creek; gravity-type dam, 11 ft tall and 80 ft long.

Surface area
600 ac
Normal storage
1,900 ac-ft
Max storage
4,000 ac-ft
Drainage area
150 sq mi
Hazard class
Low
Owner
MNDNR

Source: USACE National Inventory of Dams, NID ID MN00020 · Operator website

EPA Impairment Status

Two Inlets Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN03-0017-00 · Official waterbody report

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Ice data from Minnesota DNR Climate

Most recent sample: 2024-09-09

Monitoring stations: 1