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Second Crow Wing Lake

Hubbard County, MinnesotaMesotrophic

On the LakeGrade rubric, Second Crow Wing Lake pulls an A: clarity at 11.3 ft and 14 µg/L of phosphorus put it in the top bracket for Minnesota. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Mesotrophic conditions dominate at Second Crow Wing Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. A maximum depth of 35 ft puts Second Crow Wing Lake in the middle of Minnesota's depth distribution. At 221 acres, Second Crow Wing Lake fits the Minnesota median for monitored lakes, with 3.1 miles of shoreline. Within Hubbard County's 78 graded lakes, Second Crow Wing Lake ranks 49 — below the local median, though not at the bottom.

Second Crow Wing Lake has at least one documented invasive species (faucet snail), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. Walleye are documented at Second Crow Wing Lake, one of 15 fish species on record for the lake. The lake lacks a documented public access point, so visitor use is limited. 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 2025-07-21. Grade methodology: LakeGrade methodology.

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Good clarity, visible to about 11.3 ft. Phosphorus level: 14 µg/L. Trophic State Index: 42.

MetricValueGrade
Water Clarity (Secchi Depth)11.3 ftB
Phosphorus14 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)42Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth35 ft
Average Depth14 ft
Surface Area221.44 acres
Shoreline Length3.1 mi
Littoral Zone44%
Public AccessNo

Fish Species

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

→ Best fishing times for Second Crow Wing Lake (14-day solunar calendar)

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

Second Crow Wing 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.

faucet snail

Water Quality Trend: Declining

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

MetricTrendChange/YearYears
Water Clarity Stable+0.045 m/yr6
Phosphorus Declining+0.67 µg/L/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #49 of 78 lakes in Hubbard County

Nearby Lakes in Hubbard County

EPA Impairment Status

Second Crow Wing 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 MN29-0087-00 · Official waterbody report · Matched by proximity (1.52 km)

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

Most recent sample: 2025-07-21

Monitoring stations: 1