Cumberland Creek, is a tributary of the Skagit River, located on the middle Skagit. The Creek crosses the South Skagit Highway above Day Creek. Cumberland Creek provides high quality salmon habitat and is an excellent example of how rich in diversity the deciduous forests of the Skagit River floodplain can be. Cottonwoods, alders and big-leaf maples line the Skagit River and provide nutrients to the water, as well as homes for many species of birds and amphibians here. A total of 253 acres of valuable riparain floodplain habitat have been acquired for conservation by both the Skagit Land Trust and Seattle City Light as part of the Cumberland Creek Middle Skagit Aquistion Project, to further the protection of high quality salmon habitat in the Middle Skagit.

The Cumberland Creek Mitigation Project is a collaboration between land owners the Skagit Land Trust and Seattle City light who are working with Skagit County, the Army Corps of Engineers and Skagit River System Cooperative to restore Cumberland Creek to an historic channel. The project was initiated to mitigate for habitat impacts from repair work on the Cockreham Island Levee. The project is intended to restore Cumberland Creek to an historic channel that would add approximately 4,000 feet of low gradient tributary in the floodplain of the Skagit River. The work to reconnect Cumberland includes installing a wood-debris "fence" and digging a short section of creek bed from the current channel to the historic one. This new section of creek bed will only use native materials and is designed to act naturally within the Skagit's floodplain. On completion this project will likely provide additional spawning and rearing habitat for coho, Chinook, and other species of salmon.