The US Army Corps of Engineers, Sacramento Division updated wetland and stream maps for the 6 county area (Sacramento, Placer, Yolo, El Dorado, Yuba, and Sutter Counties) to support regulatory, planning, and management efforts in the area.  The map was made public in 2011 and was added to EcoAtlas in 2013.

View the Six County streams data online at EcoAltas.