Big Lake is a census-designated place (CDP) in Matanuska-Susitna Borough, Alaska, United States. It is part of the Anchorage, Alaska Metropolitan Statistical Area. The population was 3,350 at the 2010 census, up from 2,635 in 2000.
Big Lake is located at 61°32′15″N 149°53′28″W (61.537449, -149.891104).
According to the United States Census Bureau, the CDP has a total area of 144.8 square miles (375 km2), of which, 131.9 square miles (342 km2) of it is land and 12.9 square miles (33 km2) of it (8.89%) is water.
Big Lake, Alaska experiences an average of 51.4 inches of snowfall per year, 109 precipitation days, 131 sunny days, and an average annual wind speed of 8.18 MPH.
The area is home to three Alaska State Parks facilities. Big Lake North State Recreation Site is a 19 acres (7.7 ha) park with a large campground, picnic areas, boat launch, and jetski rentals. Big Lake South State Recreation Site has a smaller campground, picnic sites, and boat launch. Winter activities in both parks include cross country skiing, ice fishing, and dog mushing.
The Rocky Lake State Recreation Site is a 49 acres (20 ha) park with a campground, picnic areas, and lake access.
As of the 2010 census, Big Lake had a population of 3,350. As of the 2017 American Community Survey, it was estimated to have 3,136 residents, of whom 53.2% were male, 46.8% were female, 82.8% were white, 5.2% were Native American or Alaska Native, 0.7% were Asian, and 11.3% were two or more races.