Pine Mountain Lake (Cook County)

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

Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 16010800

DNR records show 7 stocking entries at Pine Mountain Lake (Cook County) since 2016, most recently splake fingerlings in 2024 (6,900 fish).

• Pine Mountain Lake (Cook County) has 7 DNR stocking records across 7 years (2016-2024): splake (7).
• The most-stocked species by count is splake: 42,900 fish on record.
• Maximum depth 30 ft, mean depth 12 ft; surface area 106 acres, 68 littoral acres, 2.1 miles of shoreline, per the DNR lake survey.
• Average water clarity (Secchi depth) 8.0 ft.
• Fish species DNR lists here: splake, white sucker.
• 1 public access on the DNR list.
• Most recent DNR fish survey: September 22, 2021 (standard survey).
• Cook County, nearest town Grand Marais; DNR lake number (DOW) 16010800.

Stocking history

Public accesses

DNR fish survey, 2021

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.

Pine Mountain is a designated stream trout lake, managed for a variety of trout species since at least 1934. The current (2010) lake management plan continued a stocking regime for Splake that called for 6,000 fingerlings to be stocked annually. The long range goal for Splake in this lake is a minimum trap net catch of 4.8 fish/net, with some fish over 16 inches present. This was to have been the third of three surveys scheduled in the 2010 LMP to evaluate Splake stocking, monitor summer water quality, and monitor the lake for introductions of undesirable fish species. The first (in 2011) was canceled due to a lack of staff and funding, but the second was completed as planned in 2016. Splake were apparently abundant in 2021. Most of the fish collected were 12 to 16 inches in length, with a few larger fish (up to 19 inches in length) present. The 2021 Splake trap net catch easily exceeded the goal from the 2010 LMP, and the size goal in that plan was met by the capture of several fish over 16 inches in length. At 8.10 fish/net, the catch was well above the normal range (0.6-3.2 fish/net) for Splake catches in fall surveys of stream trout lakes in this area. The 2021 catch was the highest trout catch (Splake or Brook Trout) seen in this lake since at least 1993. The mean weight for Splake taken in trap nets was at the upper end of the normal range (0.58-1.18 lb/fish) for fall catches in this area. Four stocked year classes contributed to the 2021 catch, with fish from the 2016 and 2018 year classes accounting for about 90% of the total catch. Splake as old as age-6 were sampled, indicating excellent long term survival in this lake. Splake growth had been slow; fish reached a mean length of just 10.9 inches at the end of their third year, compared to an area average of 12.6 inches. Slow growth may have been due to high competition between Splake (large numbers of Splake present), competition from relatively high numbers of White Sucker also found in this survey, and high seasonal water temperatures.. Temperature-oxygen measurements made in late August as part of this survey suggest stress caused by high surface water temperatures could have contributed to slow growth of Splake. Splake are believed to have habitat requirements similar to those for Brook Trout. Optimal conditions for Brook Trout are water temperatures of 68 F or less, with at least 5.0 ppm dissolved oxygen. Water temperatures over 68 F are stressful, and prolonged exposure to those higher temperatures can result in slower growth, particularly among larger fish. Measurements in Pine Mountain…

Minnesota DNR survey narrative, September 22, 2021.

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