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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.4 ft | C |
| Phosphorus | 17.5 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 43 ft |
| Surface Area | 511.26 acres |
| Shoreline Length | 6.1 mi |
| Littoral Zone | 33% |
| Public Access | Yes |
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).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.2 m/yr | 2 |
| Phosphorus | ↑ Improving | -10.5 µg/L/yr | 2 |
Ice Season
Historical ice data from Minnesota DNR (12 observations).
Estimated open water season: 210 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2015-04-16 (2015) | 2013-05-14 (2013) |
| Ice-In | 2006-11-22 (2006) | 2007-11-27 (2007) |
Most recent ice-out: 2016-04-16
Location
County Ranking
Ranked #55 of 86 lakes in Beltrami County
Nearby Lakes in Beltrami County
More Minnesota Lake Rankings
State Parks Near Julia Lake
Other Grade B Lakes in Minnesota
Mesotrophic Lakes in Minnesota
DNR Fisheries Survey Summary
11 surveys on file from MN DNR Fisheries. Most recent: 2024-06-03 (Targeted Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Bluegill | 66.31 | 0.23 lb |
| Yellow Perch | 29.73 | 0.25 lb |
| CNM | 25.52 | — |
| Black Bullhead | 25.25 | 0.44 lb |
| Walleye | 9.22 | 2 lb |
| Largemouth Bass | 9.10 | 0.92 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
Yellow Perch
Black Bullhead
Walleye
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…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Julia Lake. 4 reports on file.
- —Fisheries Lake Survey — JuliaFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Julia (1751)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — JuliaFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — JuliaPublic Water Access Sites · MN DNR LakeFinder
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