Crooked Lake
Anoka County, MinnesotaMesotrophic
Crooked Lake comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.
The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. Crooked Lake reaches 26 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. Crooked Lake covers 115 acres alongside 2.9 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within Anoka County's 24 graded waters, Crooked Lake sits at rank 5, near the top of the local distribution.
Crooked Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. The fishery is bass-led, with 12 documented species across the lake's records. A documented public access point at Crooked Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 15 times at Crooked Lake, with a median around Apr 4. 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, Minnesota DNR LakeFinder, last sampled 2024-09-18. 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 7.4 ft. Phosphorus level: 24 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.4 ft | C |
| Phosphorus | 24 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 26 ft |
| Surface Area | 114.93 acres |
| Shoreline Length | 2.9 mi |
| Littoral Zone | 75% |
| Public Access | Yes |
Fish Species
Click a species to see all Minnesota and Wisconsin lakes where it is found.
→ Best fishing times for Crooked Lake (14-day solunar calendar)
→ Is it safe to eat fish from Crooked Lake? (mercury & PFAS guide)
→ Crooked Lake fishing regulations (limits, seasons, special rules)
Invasive Species
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.019 m/yr | 5 |
| Phosphorus | ↑ Improving | -0.6 µg/L/yr | 5 |
Ice Season
Historical ice data from Minnesota DNR (25 observations).
Estimated open water season: 236 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2017-03-10 (2017) | 2014-04-23 (2014) |
| Ice-In | 2001-11-02 (2001) | 2007-12-01 (2007) |
Most recent ice-out: 2026-03-28
Location
County Ranking
Ranked #5 of 24 lakes in Anoka County
Nearby Lakes in Anoka County
More Minnesota Lake Rankings
State Parks Near Crooked Lake
Other Grade B Lakes in Minnesota
Mesotrophic Lakes in Minnesota
DNR Fisheries Survey Summary
19 surveys on file from MN DNR Fisheries. Most recent: 2021-07-19 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Largemouth Bass | 8069.84 | 1.12 lb |
| Bluegill | 74.09 | 0.11 lb |
| BLH | 26.25 | 0.24 lb |
| Black Crappie | 11.27 | 0.15 lb |
| GOS | 5.50 | 0.06 lb |
| Black Bullhead | 4.94 | 0.44 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.
Largemouth Bass
Bluegill
Black Crappie
Black Bullhead
From the 2021-07-19 survey
Crooked Lake is a 115 acre lake in Anoka County assigned to lake class 30. Primarily managed for Largemouth Bass, a special catch and release only regulation for Bass was implemented in 2002. Walleye and Channel Catfish have been stocked previously but these efforts were discontinued after 2015 since they failed to…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Crooked Lake. 3 reports on file.
- —Fisheries Lake Survey — CrookedFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — CrookedFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — CrookedPublic Water Access Sites · MN DNR LakeFinder
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: 2024-09-18
Monitoring stations: 2