Eagles Nest Lake
St. Louis County, MinnesotaOligotrophic
Eagles Nest Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in St. Louis County. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.
A TSI value of 35 puts Eagles Nest Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. The lake bottoms out at 49 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. At 1,028 acres, Eagles Nest Lake is one of the larger lakes in St. Louis County, with 16.3 miles of shoreline supporting multiple distinct use patterns. Among the 215 graded lakes in St. Louis County, Eagles Nest Lake ranks 3 — in the top quartile locally.
No invasive species are currently listed at Eagles Nest Lake — the lake remains off the Minnesota infested-waters roster. Walleye are documented at Eagles Nest Lake, one of 9 fish species on record for the lake. A documented public access point at Eagles Nest Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 18 observed ice-outs, centered near Apr 29. 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 2025-09-28. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 15.5 ft down. Phosphorus level: 7 µg/L. Trophic State Index: 35.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 15.5 ft | A |
| Phosphorus | 7 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 35 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 49 ft |
| Surface Area | 1,028 acres |
| Shoreline Length | 16.3 mi |
| Littoral Zone | 54% |
| Public Access | Yes |
Fish Species
Click a species to see every graded lake where it is documented.
→ Best fishing times for Eagles Nest Lake (14-day solunar calendar)
→ Is it safe to eat fish from Eagles Nest Lake? (mercury & PFAS guide)
→ Eagles Nest Lake fishing regulations (limits, seasons, special rules)
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.021 m/yr | 6 |
Recreation & Access
Ice Season
Historical ice data from Minnesota DNR (32 observations).
Estimated open water season: 206 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2017-04-11 (2017) | 2013-05-13 (2013) |
| Ice-In | 2019-11-07 (2019) | 2016-12-10 (2016) |
Most recent ice-out: 2025-05-04
Location & Depth Map
Free interactive depth-contour map of Eagles Nest Lake, reaching a maximum surveyed depth of 40 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Minnesota DNR.
County Ranking
Ranked #3 of 215 lakes in St. Louis County
Nearby Lakes in St. Louis County
More Minnesota Lake Rankings
State Parks Near Eagles Nest Lake
Other Grade A Lakes in Minnesota
Oligotrophic Lakes in Minnesota
Compare Eagles Nest Lake With Nearby Lakes
DNR Fisheries Survey Summary
7 surveys on file from MN DNR Fisheries. Most recent: 2025-08-18 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| BNS | 15.56 | — |
| Yellow Perch | 13.18 | 0.09 lb |
| Bluntnose Minnow | 7.17 | — |
| BUB | 6.47 | 2.23 lb |
| Walleye | 5.93 | 1.19 lb |
| Bluegill | 5.59 | 0.19 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.
Yellow Perch
BUB
Walleye
Bluegill
From the 2025-08-18 survey
Eagles Nest 3 (69-0285-03) is a 1,028-acre lake located 8 miles east of Tower. It is accessed by a concrete ramp off the Eagles Nest 3 access road which is off the Bear Head Lake State Park Road. A state park vehicle permit is required to launch and park at this access. The lake has a maximum depth of 49 feet and had…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Eagles Nest Lake. 3 reports on file.
- —Fisheries Lake Survey — Eagles Nest #3Fisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Eagles Nest #3 (1876)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — Eagles Nest #3Public Water Access Sites · MN DNR LakeFinder
EPA Impairment Status
Eagles Nest 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 MN69-0285-03 · Official waterbody report · Matched by proximity (0.52 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
Public boat-access points from the USGS National Boat Ramps inventory
Ice data from Minnesota DNR Climate
Most recent sample: 2025-09-28
Monitoring stations: 10
Where to stay near Eagles Nest Lake
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