Minnesota DNR fisheries surveys · latest August 9, 2021
Armstrong Lake FishingNRNot rated for water quality
Minnesota DNR surveys at Armstrong Lake average 11.73 largemouth bass per unit of sampling effort (CPUE) across 8 surveys. The most recent is a Standard Survey dated August 9, 2021. Length samples in the latest survey that recorded them ran 4–17 inches. In St. Louis County, Minnesota, Armstrong Lake has no letter grade — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Water clarity averages 16.2 feet of visibility, and there is one public boat landing. The survey figures on this page are Minnesota DNR's own; the water-quality grade comes from EPA Water Quality Portal samples. Neither is a forecast of today's bite.
Species recorded at Armstrong Lake
10 species on the Minnesota DNR list for this lake. A species on the list has been recorded here; it does not mean it is catchable today or in every part of the lake.
Stocking at Armstrong Lake
Minnesota DNR publishes a stocking history for this lake — which species went in, how many, and in which years. Read the years: a lake stocked in one year is not necessarily stocked in the next.
Getting on the water
1 public boat landing is recorded on Armstrong Lake. Minnesota DNR lists the public access sites, including ramp type and parking, in the documents below.
Survey results in full
Minnesota DNR surveys at Armstrong Lake average 11.73 largemouth bass per unit of sampling effort (CPUE) across 8 surveys. The most recent is a Standard Survey dated August 9, 2021. Length samples in the latest survey that recorded them ran 4–17 inches.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Armstrong Lake — official chemistry is on file, not a letter, and the water-quality trend over 5 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
8 surveys on file from MN DNR Fisheries. Most recent: 2021-08-09 (Standard Survey).
Top Species by Catch Rate
| Species | Avg catch rate (CPUE) | Avg Weight |
|---|---|---|
| Bluegill | 24.60 | 0.17 lb |
| Largemouth Bass | 11.73 | 0.74 lb |
| Walleye | 3.43 | 3.21 lb |
| White Sucker | 3.34 | 2.27 lb |
| Northern Pike | 3.15 | 2.32 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE means more abundant in standardized sampling. This is not a weekly bite report.
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.
Bluegill
Largemouth Bass
Walleye
White Sucker
From the 2021-08-09 survey
Armstrong Lake is a 382 acre lake located 10 miles west of Ely. It is accessed by a concrete ramp off Hwy 169. The lake has a maximum depth of 34 feet and clear water at the time of this survey. On August 9, 2021 the lake was thermally stratified with a surface temperature of 72 F and a bottom temperature of 54 F.…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Armstrong Lake. 4 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — ArmstrongFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Armstrong (1864)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — ArmstrongFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — ArmstrongPublic Water Access Sites · MN DNR LakeFinder
Common questions
What fish are in Armstrong Lake?
Minnesota DNR surveys at Armstrong Lake average 11.73 largemouth bass per unit of sampling effort (CPUE) across 8 surveys. The most recent is a Standard Survey dated August 9, 2021. Length samples in the latest survey that recorded them ran 4–17 inches. Minnesota DNR lists 10 species for the lake in total. Those are survey results, not a catch report: a net set on one date measures what was in that net.
When was Armstrong Lake last surveyed?
The most recent fisheries survey on file for Armstrong Lake is dated August 9, 2021. Survey intervals vary by lake and by species; a gap of several years between surveys is normal and does not mean the record is missing.
Is Armstrong Lake stocked?
Minnesota DNR publishes a stocking history for Armstrong Lake. It records which species were released, in what numbers and in which years — the source documents are linked further down this page. A lake can be stocked in some years and not others, so read the years rather than assuming an annual release.
Does the water-quality grade tell me how Armstrong Lake fishes?
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Armstrong Lake — official chemistry is on file, not a letter, and the water-quality trend over 5 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Before you eat what you catch
A water-quality grade is not a consumption advisory. Mercury and PCB advice for Minnesota waters comes from MDH, and it is issued per species and per size class — a lake can grade well and still carry a meal limit on larger predator fish.
Where to stay near Armstrong Lake
Top-rated places to stay near Armstrong Lake
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