This project encourages visitors to the park to observe and document biodiversity in an ongoing urban ecological drainage restoration. Isaac Crossman Park sits along Four Mile Run, a stream that flows into the Potomac River. The City of Falls Church (22046) manages 7.3 acres of heavily wooded area and a walking/bike path on the west side of the stream. Arlington County (22205) manages a passive 3 acres of woods on the east side of the stream.

Observations may be of amphibians, birds, insects, fish, fungi, plants and trees, reptiles, and wild animals. Please no photos of human visitors. less ↑