The largest off-leash area anywhere near Portland, a former floodplain at the confluence of the Sandy and Columbia rivers with meadows, cottonwood groves, a network of dirt tracks and long stretches of gravel and sand river bank. Dogs swim in the Sandy, which is shallow and slow at the edges through the summer. Locals call it Thousand Acres, and on a warm weekend it is essentially a dog festival.
Normas: Off-leash across most of the site, but dogs must be leashed in the parking lot, within 100 feet of the Confluence Trail and near the Bird Blind, because the Confluence Trail is an accessible public path intended for visitors who do not want to meet a loose dog. Keep an off-leash dog in sight and under voice control at all times. There is a fine for an off-leash dog in the parking lot, so clip the lead on before you open the car door.





