In fall, target rainbow trout in mid-depth waters as temperatures cool, using bait like PowerBait or garlic-scented eggs near channels and the dam. Bass and other warmwater fish remain active in transitional areas between shallows and deeper zones throughout the day.

Hagg Lake is one of western Oregon's largest lakes and is a premier warmwater fishing destination. The lake is home to both the state record smallmouth bass and bullhead catfish.

Current reservoir level can be found here. Maintained and operated by Washington County, the park features numerous picnic areas, two boat launching facilities, more than 15 miles of hiking trails, and observation decks for wildlife and bird watching. The lake and lake park are currently open, although users are encouraged to check the Hagg Lake Park website, as conditions can change.