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LakeQuality
B

Julia Lake

Beltrami County, MinnesotaMesotrophic

On the LakeGrade scale Julia Lake grades a B, with clarity at 7.4 ft and 18 µg/L of phosphorus placing it above the Minnesota median. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

Mesotrophic conditions dominate at Julia Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. A maximum depth of 43 ft puts Julia Lake in the middle of Minnesota's depth distribution. At 511 acres, Julia Lake fits the Minnesota median for monitored lakes, with 6.1 miles of shoreline. Within Beltrami County's 86 graded lakes, Julia Lake ranks 55 — below the local median, though not at the bottom.

No invasive species are currently listed at Julia Lake — the lake remains off the Minnesota infested-waters roster. Walleye are documented at Julia Lake, one of 10 fish species on record for the lake. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been recorded 8 times at Julia Lake, with a median around 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 2021-07-18. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Moderate clarity, visible to about 7.4 ft. Phosphorus level: 17.5 µg/L. Trophic State Index: 47.

MetricValueGrade
Water Clarity (Secchi Depth)7.4 ftC
Phosphorus17.5 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)47Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth43 ft
Surface Area511.26 acres
Shoreline Length6.1 mi
Littoral Zone33%
Public AccessYes

Fish Species

Click a species to see all Minnesota and Wisconsin lakes where it is found.

→ Best fishing times for Julia Lake (14-day solunar calendar)

→ Is it safe to eat fish from Julia Lake? (mercury & PFAS guide)

Julia Lake fishing regulations (limits, seasons, special rules)

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Declining-0.2 m/yr2
Phosphorus Improving-10.5 µg/L/yr2

Ice Season

Historical ice data from Minnesota DNR (12 observations).

Typical Ice-Out
Apr 29
Typical Ice-In
Nov 25

Estimated open water season: 210 days

EarliestLatest
Ice-Out2015-04-16 (2015)2013-05-14 (2013)
Ice-In2006-11-22 (2006)2007-11-27 (2007)

Most recent ice-out: 2016-04-16

Location

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County Ranking

Ranked #55 of 86 lakes in Beltrami County

Nearby Lakes in Beltrami County

DNR Fisheries Survey Summary

11 surveys on file from MN DNR Fisheries. Most recent: 2024-06-03 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Bluegill66.310.23 lb
Yellow Perch29.730.25 lb
CNM25.52
Black Bullhead25.250.44 lb
Walleye9.222 lb
Largemouth Bass9.100.92 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.

Bluegill

514 fish · 29 in · 2024-06-03
174870trophy 1023456789

Yellow Perch

68 fish · 58 in · 2023-08-14
221105678

Black Bullhead

1 fish · 1010 in · 2018-08-13
1010

Walleye

84 fish · 529 in · 2023-08-14
950trophy 246810121416182022242628

From the 2024-06-03 survey

In spring 2021, a daily bag limit reduction for sunfish (5 fish/day) was implemented on Lake Beltrami as part of the statewide Quality Sunfish Initiative (QSI). The goal of this special regulation is to maintain or improve Bluegill size structure by reducing angler harvest. In order to evaluate effectiveness of the…

Source: MN DNR LakeFinder Fisheries Lake Survey

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Julia Lake. 4 reports on file.

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Ice data from Minnesota DNR Climate

Most recent sample: 2021-07-18

Monitoring stations: 1