Boulder Lake
St. Louis County, Minnesota
Today's Fishing Forecast
Fishing looks to be fairly active with peak fishing times around 2-4 PM. SEE MORE
Share Your Catch & Win!
Frequently Asked Questions About Boulder Lake, MN
- How big is Boulder Lake?
- How deep is Boulder Lake?
- What kind of fish can you catch in Boulder Lake?
- Are there places to stay in the Boulder Lake area?
- Are there boat launches on Boulder Lake?
- Are there places to eat and drink near Boulder Lake?
- What is the average air temp for Boulder Lake?
- Are there any state parks near Boulder Lake?
How big is Boulder Lake?
How deep is Boulder Lake?
What kind of fish can you catch in Boulder Lake?
Other fish species in the lake include Golden Shiner, Johnny Darter, Spottail Shiner, Tadpole Madtom and White Sucker.
Are there places to stay in the Boulder Lake area?
More Lodging Options
Are there boat launches on Boulder Lake?
Are there places to eat and drink near Boulder Lake?
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History & Status of the Fishery
A fall young-of-the-year (YOY) Walleye assessment was conducted on Boulder Lake Reservoir on 9/28/2023. Boulder young-of-the-year (YOY) and age-1 Walleye have been indexed annually with night electrofishing since 2002. These data are important as an early indicator of Walleye year-class strength for Boulder. Boulder has not been stocked with Walleye since 1991 because the population has been able to adequately sustain itself through natural reproduction.
A total of 298 YOY Walleye with an average length of 4.3 inches were captured during the 2023 investigation for a catch rate of 325.3 per hour of electrofishing. Catch rates from previous investigations ranged from 13.0 to 261.5 per hour of electrofishing. Average length from previous investigations ranged from 3.7 to 6.2 inches. Average length at the end of the first growing season has been strongly correlated to survival to age-1 in other area lakes. The below average size but above average abundance of YOY Walleye suggests that a strong year-class from 2023 is possible.
A total of 9 age-1 Walleye were also sampled for a catch rate of 9.8 per hour of electrofishing. Catch rates from previous investigations ranged from 2.2 to 62.9 per hour of electrofishing. Average length of age-1 Walleye was 8.0 inches. Previous average lengths for age-1 Walleye have ranged from 7.6 to 10.7 inches. The below average size and abundance of age-1 Walleye captured suggests that a weak year-class from 2022 is likely for Boulder Reservoir.
What is the average air temp for Boulder Lake?
Are there any state parks near Boulder Lake?
For more Minnesota State Park information see our State Park Guide.
More Nearby Lakes To Explore
There's more lake's to explore around Boulder Lake...| DISTANCE | ACRES | MAX DEPTH | |
| South Twin Lake | 2.7 mi | 67 | |
| South Twin Lake | 2.7 mi | 66 | 15 ft |
| Slew Lake | 2.8 mi | 22 | |
| North Twin Lake | 3.0 mi | 47 | 12 ft |
| North Twin Lake | 3.0 mi | 47 | |
| Island Lake Reservoir | 3.4 mi | 8,001 | 94 ft |
| Unnamed Lake | 3.7 mi | 10 | |
| Stroud Lake | 3.9 mi | 32 | |
| Unnamed Lake | 3.9 mi | 665 | |
| Unnamed Lake | 4.0 mi | 12 |
