Minnesota DNR fisheries surveys · latest August 11, 2025
Mountain Lake FishingNRNot rated for water quality
Minnesota DNR surveys at Mountain Lake average 2.61 smallmouth bass per unit of sampling effort (CPUE) across 15 surveys. The most recent is a Targeted Survey dated August 11, 2025. Length samples in the latest survey that recorded them ran 7–18 inches. In Unknown County, Minnesota, Mountain Lake has no letter grade — no EPA ecoregion for this lake, so the National Lakes Assessment condition thresholds cannot be applied. Water clarity averages 19.0 feet of visibility, and the lake has public access. 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 Mountain Lake
7 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 Mountain Lake
No stocking record for Mountain Lake appears in the Minnesota DNR material on file. That is an absence in the published record, not a confirmation that the lake is unstocked — some waters are managed as naturally reproducing and never appear in a stocking list at all.
Getting on the water
Minnesota DNR lists the public access sites, including ramp type and parking, in the documents below.
Survey results in full
Minnesota DNR surveys at Mountain Lake average 2.61 smallmouth bass per unit of sampling effort (CPUE) across 15 surveys. The most recent is a Targeted Survey dated August 11, 2025. Length samples in the latest survey that recorded them ran 7–18 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 Mountain 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
15 surveys on file from MN DNR Fisheries. Most recent: 2025-08-11 (Targeted Survey).
Top Species by Catch Rate
| Species | Avg catch rate (CPUE) | Avg Weight |
|---|---|---|
| Tullibee (Cisco) | 9.17 | 0.69 lb |
| Yellow Perch | 2.78 | 0.24 lb |
| Smallmouth Bass | 2.61 | 0.6 lb |
| Lake Trout | 2.54 | 1.74 lb |
| White Sucker | 1.62 | 2.05 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.
Tullibee (Cisco)
Yellow Perch
Smallmouth Bass
Lake Trout
From the 2025-08-11 survey
Temperature and dissolved oxygen measurements were collected from the deepest basin in Clearwater Lake on August 11th, 2025. This was done to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Trout, the most sensitive coldwater species present in this lake (Cisco,…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Mountain Lake. 3 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — ClearwaterFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Clearwater (1828)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — ClearwaterPublic Water Access Sites · MN DNR LakeFinder
Common questions
What fish are in Mountain Lake?
Minnesota DNR surveys at Mountain Lake average 2.61 smallmouth bass per unit of sampling effort (CPUE) across 15 surveys. The most recent is a Targeted Survey dated August 11, 2025. Length samples in the latest survey that recorded them ran 7–18 inches. Minnesota DNR lists 7 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 Mountain Lake last surveyed?
The most recent fisheries survey on file for Mountain Lake is dated August 11, 2025. 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 Mountain Lake stocked?
No stocking record for Mountain Lake appears in the Minnesota DNR material on file. That is not the same as a confirmed unstocked lake: it means no stocking document was published for it in the records this page draws on.
Does the water-quality grade tell me how Mountain 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 Mountain 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 Mountain Lake
Top-rated places to stay near Mountain Lake
Planning a trip to Mountain Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Mountain Lake — straight to your inbox. No spam, unsubscribe anytime.