Seventh Crow Wing Lake
Seventh Crow Wing Lake in Hubbard County, Minnesota has a water quality grade of C (Fair). Water clarity: 6.9 ft visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 7.6 µg/L. Maximum depth: 42 ft. Surface area: 262.4 acres.
- Clarity
- 6.9 ft
- Typical in August
- 73°F
- Max depth
- 42 ft
- Area
- 262 acres
- Type
- Eutrophic
- Trend
- ↑ Improving
- Public access
- No
Next lake in Hubbard County
Seventh Crow Wing Lake is a 262-acre productive, nutrient-rich eutrophic lake in Hubbard County, Minnesota with a maximum depth of 42 feet (16-foot average). Water quality is graded C based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. The lake supports 14 documented fish species including black crappie, bluegill, and bowfin (dogfish). No public access — the lake is private or restricted. Compared to the 67 other monitored lakes in Hubbard County, Seventh Crow Wing Lake ranks #63 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-22. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyModerate
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Moderate clarity, visible to about 6.9 ft. Phosphorus level: 25 µg/L. Chlorophyll-a: 7.6 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.9 ft | Not graded |
| Phosphorus | 25 µg/L | Fair |
| Chlorophyll-a (Algae) | 7.6 µg/L | Fair |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Seventh Crow Wing Lake
Compare lakeside cabins, hotels, and vacation rentals near Seventh Crow Wing Lake in Hubbard County, Minnesota — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Water Temperature
Seventh Crow Wing Lake typically sits around 73°F at the surface in August. Summer average is about 70°F. Usually warmest in Aug (about 73°F) and coldest in May (about 55°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 46 field readings (2011–2024) via the EPA Water Quality Portal. See the full Seventh Crow Wing Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 42 ft |
| Average Depth | 16 ft |
| Surface Area | 262 acres |
| Shoreline Length | 3.2 mi |
| Littoral Zone | 46% |
| Public Access | No |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Seventh Crow Wing Lake
DNR Fisheries Survey Summary
12 surveys on file from MN DNR Fisheries. Most recent: 2024-07-29 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Yellow Perch | 21.48 | 0.11 lb |
| Bluegill | 16.43 | 0.24 lb |
| Pumpkinseed | 7.03 | 0.18 lb |
| Walleye | 4.80 | 2.42 lb |
| Largemouth Bass | 4.76 | 0.98 lb |
| IOD | 3.22 | — |
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
Bluegill
Pumpkinseed
Walleye
From the 2024-07-29 survey
Seventh Crow Wing Lake is located two miles southeast of Nevis in southern Hubbard County. Seventh Crow Wing is part of a chain of lakes running from Eleventh Crow Wing Lake at the headwaters, down to First Crow Wing Lake. Seventh Crow Wing Lake has a surface area of 261 acres and a maximum depth of 42 feet. A…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Seventh Crow Wing Lake. 3 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — Seventh Crow WingFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Seventh Crow Wing (1312)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — Seventh Crow WingFish Stocking History · MN DNR LakeFinder
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.026 m/yr | 6 |
| Phosphorus | ↑ Improving | -1.33 µg/L/yr | 6 |
| Chlorophyll-a | → Stable | -0.12 µg/L/yr | 6 |
EPA Impairment Status
Seventh 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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN29-0091-00 · Official waterbody report
County Ranking
Ranked #63 of 68 lakes in Hubbard County
Nearby Lakes With Higher Grades
Seventh Crow Wing Lake holds Grade C. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Hubbard County
Frequently asked questions about Seventh Crow Wing Lake
What is the water quality grade for Seventh Crow Wing Lake?
- Seventh Crow Wing Lake in Hubbard County, Minnesota has a water quality grade of C (Fair). Water clarity: 6.9 ft visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 7.6 µg/L. Maximum depth: 42 ft. Surface area: 262.4 acres.
Is Seventh Crow Wing Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Seventh Crow Wing Lake has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 7.6 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Seventh Crow Wing Lake?
- Seventh Crow Wing Lake typically sits around 73°F at the surface in August, from 46 EPA Water Quality Portal field readings (2011–2024). That is a typical value for the month, not a live reading.
How deep is Seventh Crow Wing Lake?
- Seventh Crow Wing Lake has a maximum depth of 42 feet and an average depth of 16 feet. The lake covers 262.4 acres.
What fish are in Seventh Crow Wing Lake?
- Fish species found in Seventh Crow Wing Lake include black crappie, bluegill, bowfin (dogfish), brown bullhead, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, rock bass, tullibee (cisco), walleye, white sucker, yellow bullhead, yellow perch. Seventh Crow Wing Lake is located in Hubbard County, Minnesota.
Explore Seventh Crow Wing Lake across LakeGrade
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Where this data comes from
87 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA87 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder