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B
Beltrami County, Minnesota

Pug Hole Lake

Grade BGood · 10.7 ft clarity

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Mesotrophic

Pug Hole Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Mesotrophic conditions dominate at Pug Hole Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Pug Hole Lake sits at rank 61 of 95 in Beltrami County, in the lower half of the local distribution.

Pug Hole Lake is on the Minnesota infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. The state fisheries records do not list documented species for Pug Hole Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. 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 2025-10-15. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

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Water Quality Grade: B, Good

Good clarity, visible to about 10.7 ft. Chlorophyll-a: 6.2 µg/L. Trophic State Index: 46.

MetricValueGrade
Water Clarity (Secchi Depth)10.7 ftB
PhosphorusNo data
Chlorophyll-a (Algae)6.2 µg/LB
Trophic State Index (TSI)46Mesotrophic

Moderate nutrients, good water quality

Where to stay near Pug Hole Lake

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Fishing Pug Hole Lake

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

zebra mussel

Water Quality Trend: Stable

Based on 2 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.323 m/yr2
Chlorophyll-a Declining+0.87 µg/L/yr2

Water Temperature

Pug Hole Lake averages about 61°F at the surface in summer, usually warmest in Jul (about 62°F) and coldest in May (about 52°F). These are typical values by month — not a live reading.

Jan
Feb
Mar
Apr
May
52°
Jun
58°
Jul
62°
Aug
62°
Sep
59°
Oct
55°
Nov
Dec

Typical surface water temperature by month, from 70 field readings (20252025) via the EPA Water Quality Portal. See the full Pug Hole Lake water temperature breakdown →

Location

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County Ranking

Ranked #61 of 95 lakes in Beltrami County

Cleaner Lakes Within 30 Miles

Pug Hole Lake holds Grade B. 2 nearby lakes hold higher grades.

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Nearby Lakes in Beltrami County

State Parks Near Pug Hole Lake

More records, surveys & data sources

Lake Size & Watershed

Watershed (drainage) area
1,081 sq mi
Surface area
18,983 acres
Mean depth (est.)
28.5 ft
Shoreline
70.8 mi
Elevation
1,289 ft

Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.

Data Sources

Water quality data from the EPA Water Quality Portal

Lake size & watershed from HydroLAKES (HydroSHEDS)

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-10-15

Monitoring stations: 1

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