The Crooked River Forest, located in Harrison, consists of two main parcels: Intervale (334 acres) and Woodsum Brook (75 acres).

Intervale contains more than a mile of frontage along the spectacular Crooked River, the main tributary to Sebago Lake, as well as two main trails great for walking, running, and snowshoeing. Woodsum Brook has no established trails. 

The Crooked River is 50 miles in length, flowing from Songo Pond in Bethel through Albany, Waterford, Norway, Otisfield, Harrison, Casco, and Naples, where it joins the Songo River before flowing into Sebago Lake. The Crooked River watershed, which is part of the larger Presumpscot River Basin, contains 76,000 acres of predominantly forest land in a drainage area of 275 square miles.

"As goes the Crooked River, so goes Sebago Lake.” The Crooked River is the largest tributary to Sebago Lake, with nearly 40% of the inflow. Sebago Lake is the second largest lake in the state of Maine at over 30,000 acres and is the primary drinking water supply for 200,000 people who live and work in 11 communities in the greater Portland area.

The river supports one of only four known indigenous populations of landlocked Atlantic salmon in Maine and is the primary spawning and nursery area for such salmon indigenous to Sebago Lake.