Castle Creek is a tributary of the North Fork Toutle River on the flank of Mount St. Helens in Washington state.

The outflow of Castle Lake joins the creek at the lake's north end (46°15′29″N 122°16′19″W / 46.258°N 122.272°W / 46.258; -122.272 (South Fork Castle Creek confluence)) after traveling a few hundred meters on the South Fork Castle Creek.

[2] It joins the North Fork Toutle River at 46°16′59″N 122°17′37″W / 46.28302°N 122.29359°W / 46.28302; -122.29359 (Castle Creek mouth), elevation 2,200 feet.

[3] Pre-1980 maps show this area as "Castle Creek Marsh".

This article related to a river in the state of Washington is a stub.