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Thunder Lake (Cass County)

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

Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 11006200

DNR records show 5 stocking entries at Thunder Lake (Cass County) since 2017, most recently walleye fingerlings in 2025 (11,752 fish).

Thunder Lake (Cass County) has 5 DNR stocking records across 5 years (2017-2025): walleye (5).
The most-stocked species by count is walleye: 47,614 fish on record.
Maximum depth 95 ft, mean depth 37 ft; surface area 1,347 acres, 226 littoral acres, 15.9 miles of shoreline, per the DNR lake survey.
Average water clarity (Secchi depth) 17.5 ft.
Fish species DNR lists here: black crappie, bluegill, bowfin (dogfish), brown bullhead, burbot, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, rock bass, shorthead redhorse, smallmouth bass, and 5 more.
1 public access on the DNR list.
Most recent DNR fish survey: September 10, 2025 (targeted survey).
Cass County, nearest town Remer; DNR lake number (DOW) 11006200.

Depth map

0 ft15 ft30 ft45 ft60 ft75 ftcontour levels thinned for the web

Bathymetric contours from the Minnesota DNR lake survey mapped 4/16/1937 (orig map); depths in feet. Simplified for the web; not for navigation.

Stocking history

Year	Species	Size	Number	Pounds
2025	Walleye²	fingerlings	11,752	452.0
2023	Walleye²	fingerlings	9,800	452.0
2021	Walleye²	fingerlings	9,040	452.0
2019	Walleye²	fingerlings	9,488	452.0
2017	Walleye²	fingerlings	7,534	452.0

² fish purchased by the DNR for stocking.

Field note · Minnesota stocks by year, not by truck day: walleye fry go in within weeks of ice-out, fingerlings and yearlings mostly in fall, and stream trout in spring and fall. A row here means the fish went in during that year; DNR adds the year's rows after the fact, so the current year can look empty until winter.

Public accesses

Type	Owner	Where
concrete ramp	Minnesota DNR	On the west end of small bay near center of west shore of main basin.

DNR fish survey, 2025

Species	Gear	Catch per net	Total catch	Avg lb
Walleye	Fall electrofishing	1.50	3	0.00

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.

Walleye fingerlings are currently stocked into Thunder Lake in odd numbered years at the rate of two pounds per littoral acre (452 pounds). Night electrofishing was conducted on Thunder Lake on September 10th, 2025, to monitor the abundance of young-of-the-year (YOY) Walleyes and evaluate the contribution of natural reproduction to the Walleye population. The total sample time was 2 hours, which resulted in a YOY Walleye catch rate of 1.5 per hour. Previous catch rates ranged from 0 to 228.3 per hour. Fish ranged in size from 6.1 to 6.7 inches, with a mean length of 6.5 inches. No age 1 and older Walleye were captured.

Minnesota DNR survey narrative, September 10, 2025.

All Minnesota stockings · every Minnesota lake with a page · state CSV · this lake on DNR LakeFinder

Stocking rows, depths, accesses and survey figures are Minnesota DNR LakeFinder data as of 2026-09-02; contours are the DNR bathymetric survey. Regulations, slot limits and special rules are on the DNR page linked above, not here.

Thunder Lake (Cass County)

Depth map

Stocking history

Public accesses

DNR fish survey, 2025

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