Gales Creek, is a tributary, 23.5 miles (37.8 km) long, of the Tualatin River in Washington County, Oregon, United States.

The headwaters of Gales Creek are on the north side of the mountain Round Top in the Northern Oregon Coast Range.

Downstream of the park, Oregon Route 6 is on the right as the stream receives North Fork Gales Creek from the left and shortly thereafter South Fork Gales Creek from the right 20.70 miles (33.31 km) from the mouth.

[6][7][8] The OWRD monitors the flow of Gales Creek at a stream gauge at the Route 47 bridge in Forest Grove.

[6] The average flow of the creek at this station in 2008, the only full calendar year for which data was available in 2010, was 202 cubic feet per second (5.7 m3/s).