Rock Lake (Wright County)

Wright County, Minnesota - DNR stocking history, depth and survey data

Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 86018200

DNR records show 12 stocking entries at Rock Lake (Wright County) since 2016, most recently walleye yearlings in 2024 (942 fish).

• Rock Lake (Wright County) has 12 DNR stocking records across 5 years (2016-2024): walleye (12).
• The most-stocked species by count is walleye: 56,813 fish on record.
• Maximum depth 37 ft, mean depth 14 ft; surface area 183 acres, 99 littoral acres, 3.0 miles of shoreline, per the DNR lake survey.
• Average water clarity (Secchi depth) 3.2 ft.
• Fish species DNR lists here: black bullhead, black crappie, bluegill, bowfin (dogfish), brown bullhead, common carp, green sunfish, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, walleye, and 3 more.
• 1 public access on the DNR list.
• Most recent DNR fish survey: August 11, 2025 (targeted survey).
• Wright County, nearest town Maple Lake; DNR lake number (DOW) 86018200.

Depth map

Bathymetric contours from the Minnesota DNR lake survey mapped 7/5/1960 (orig map); depths in feet. Simplified for the web; not for navigation.

Stocking history

Public accesses

DNR fish survey, 2025

Catch per net (CPUE) is the DNR survey's count per gill net or trap net set; higher means more of that species were sampled, not a fishing forecast. Top species per gear shown; where we have no verified common name for a DNR code, the code itself is shown.

A targeted survey of nearshore fish species in Rock Lake, was conducted on August 11th, 2025, by Area Fisheries 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 10 sampling stations. Similarly, a 50-foot seine was used to sample 1 station, and a 15-foot seine was used at 5 stations. Four stations were not seined due to deep water and dense lilies. Nearshore sampling captured 12 species of fish including no species that are intolerant of disturbance and 1 species that is tolerant of disturbance (i.e., Green Sunfish). The nearshore data were combined with trap net and gill net data from an August 2016 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., Green Sunfish and Common Carp). 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. Results from this survey provide evidence that the fish community in Rock Lake is adversely impacted by stressors, as indicated by an FIBI score below the general use impairment threshold for aquatic life use determined for similar lakes. These results are similar to previous findings which indicated that Rock Lake is impaired for biological health. The survey results will be considered when the biological health of the lake is assessed during the North Fork Crow River watershed assessment process, which will be completed in coordination with MN Pollution Control Agency. You can help protect the fish community in Rock Lake by reducing runoff, maintaining natural shorelines, and preventing the spread of invasive species.

Minnesota DNR survey narrative, August 11, 2025.

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