Deer

Deer Lake is a 1,748-acre lake about 14 miles east of Effie. It's part of a three-lake chain that flows west into the Bigfork River. The lake has a lot of shallow water (about three-quarters of the lake is less than 15 feet deep), with a maximum depth of 50 feet. Water clarity in 2025 was moderate, with about 11 feet of visibility. Walleye and Bluegill are the main focus for management, with Northern Pike, Largemouth Bass, and Smallmouth Bass also important to anglers. A protected slot limit for Walleye (17-26 inches protected, one over 26 allowed) was in place from 2005 to 2020. Bluegill limits were reduced to help improve size structure and are now set at five fish per day. Walleye fry have been stocked each year since 2014 to support the population, complimenting varying natural reproduction. Walleye numbers in 2025 were good and slightly above the lake's long-term average. Catch rates were similar to the last survey. Most fish were under 17 inches (about 77%), and the average length was just under 15 inches. Fish ranged from 8.7 to 27.4 inches. A few fish over 25 inches were present, but not many. It takes about four years for Walleye here to reach 15 inches. Eight year-classes were found, but most of the catch came from two strong recent year-classes. Overall, numbers are meeting goals, but size structure is still a bit short of targets. Year-class strength appears to play a bigger role in size than harvest regulations. Bluegill numbers were high in the summer 2025 survey-about double the last survey and the highest on record for the lake. Most fish caught in summer were small, averaging under 5 inches. However, a targeted spring survey painted a better picture. In spring, Bluegill averaged 7 inches, with fish up to 10 inches. This suggests the reduced bag limit is helping maintain some larger Bluegills, even though strong recent hatches have increased the number of smaller fish showing up in summer nets. Northern Pike numbers were right where they should be for this type of lake and similar to past surveys. Most Pike were in the low- to mid-20-inch range, averaging just over 22 inches, with fish up to 29 inches. About half of the Pike sampled fell within the protected slot for the North-central zone. Size structure was fair but below management goals for larger fish. Growth was average, with Pike reaching 21 inches by age four. Several year-classes were present, showing consistent reproduction. Black Crappie were caught in low numbers, but half of those sampled were over 10 inches, which is encouraging for anglers looking for quality fish. Smallmouth Bass were present in typical numbers, including fish over 19 inches. Largemouth Bass catches were higher than expected in 2025, mostly smaller fish, suggesting strong recent reproduction and good future potential. Yellow Perch numbers have declined compared to the lake's historical average and what is expected for lakes like Deer. Fewer perch could limit Walleye abundance. Tullibee (cisco) catches have also been very low in recent surveys, suggesting a possible decline. Other fish species present include Brown Bullhead, Hybrid Sunfish, Pumpkinseed, Rock Bass, White Sucker, and Yellow Bullhead. For anglers, Deer Lake continues to offer solid Walleye numbers with occasional larger fish, improving Bluegill size potential under the reduced bag limit, steady Northern Pike action, and opportunities for quality Smallmouth Bass and Crappie.

Deer Lake is a 1,748-acre lake located 14 miles east of Effie, MN. The lake has a maximum depth of 50 ft and 1,332 littoral acres. A 10-sunfish bag limit was implemented in March of 2006 to maintain or improve the quality Bluegill population. The sunfish regulation was modified to a 5-sunfish limit in 2023. The 2025 spring targeted survey was the seventh to evaluate the reduced bag limits for sunfish. Trap nets were set and lifted over three days. The water temperature was near 70 degrees F. Bluegill were measured for length, a sample was collected for aging, and sex was also determined. In the six prior Bluegill surveys, catches ranged from 4.6/net in 2005 to 15.4 in 2011. The 2025 catch of 18.7 fish/trap net was the highest on record. Though increasing trends in bass and panfish have been observed throughout the work area, spring weather conditions during the survey are often as responsible for the variation in catches as are changes in the population. Therefore, net catches should be interpreted cautiously. The fish in 2025 ranged from 2.6 to 9.8 inches and averaged 7.2 inches. The length distribution was good, having nearly 40% of the sample 8 inches or longer. Nine age-classes were estimated with fish up to age 10. The 2018 and 2019 year-classes represented 31 and 27 percent of the sample in 2025. The 2020 and 2021 year-classes were also well represented in 2025 (combined 33%). Growth was fast compared to lakes with similar habitat. Bluegill attained an average length of 8 inches between the sixth and seventh year of growth. The reduced sunfish bag limit appears to be achieving the goal to maintain a quality Bluegill population.

A targeted survey of nearshore fish species in Deer Lake was conducted on July 18-21, 2022, by Index of Biological Integrity (IBI) Program staff. Sampling sites were evenly spaced around the lake, and each was sampled by backpack electrofishing and seining with a 50-foot or 15-foot seine, where possible. Backpack electrofishing was completed at all 18 sampling stations, but four stations were sampled from the boat due to site conditions. Similarly, a 50-foot seine was used to sample 10 stations, a 15-foot seine was used to sample one station, and site conditions prevented the use of a seine at seven stations. Nearshore sampling captured 22 species of fish including five species that are intolerant of disturbance (i.e., Blackchin Shiner, Blacknose Shiner, Iowa Darter, Rock Bass, and Smallmouth Bass) and two that are tolerant of disturbance (i.e., Black Bullhead and Fathead Minnow). A concurrent summer trap net survey was conducted by IBI Program Staff. Fifteen trap nets were set along the shoreline and in shallow offshore locations that encompassed multiple habitat types. Bluegill and Pumpkinseed comprised a majority of the trap net catch by number and Bluegill, Walleye, and Northern Pike comprised a majority of the catch by biomass. The number of Bluegill sampled per net was above the 25% quartile for similar Lake Class 27 lakes and the average length was 6.4 inches, with 13% over 7 inches. The nearshore and trap net data were combined with gill net data from a July 2018 survey to describe the fish community and provide a Fish-based IBI (FIBI) score. The FIBI uses fish community data to measure a lake's health, and the types of fish species present can help identify any stressors that may be negatively affecting the lake environment. In Minnesota lakes, certain fish species cannot survive without clean water and a healthy habitat (e.g., Blackchin Shiner, Iowa Darter, and Rock Bass), while other species are tolerant of degraded conditions (e.g., Black Bullhead, Fathead Minnow, and Green Sunfish). The FIBI score, composed of several fish community diversity and composition metrics, indicates the overall health of a lake by comparing it to what is expected for a healthy lake. For additional information on the FIBI, search for "lake index of biological integrity" on the mndnr.gov website. Data from this survey indicates Deer Lake is in good health as indicated by an FIBI score above the impairment threshold for aquatic life use determined for similar lakes. Data from this survey will contribute biological information about the health of the fish community to the Big Fork River Watershed assessment process in coordination with MN Pollution Control Agency.

Based on Minnesota DNR survey data, anglers target Walleye, Black Crappie, Northern Pike, Rock Bass, and Hybrid Sunfish in Deer. See the full species list above for catch rates, size structure, and quality scores.

Minnesota DNR records list public access for Deer. Check the DNR LakeFinder page for the launch type and directions before you go.

Deer has a maximum depth of 50 feet, per Minnesota DNR data.

The most recent Minnesota DNR survey data for the main sport fish in Deer is from 2025.

No invasive species are on record for Deer in Minnesota DNR data. Always clean, drain, and dry your equipment to help keep it that way.