Replace the Garmire Bridge. The Tisdale Weir is a critical component of the bypass system that diverts flood waters from the Sacramento Reiver. There has been a bridge across the weir ever since the early 1900s. The single-lane Garmire Road Bridge that opened in 1935 had piers so close together that it trapped river debris and reduced the amount of water that could escape the river, causing the water to rise higher on the levees that protect the Meridian and Robbins Basins, as well as property in Colusa and Yolo counties. In a project designed and managed by Sutter County, the federal and state governments funded the construction of this new bridge and the removal of the old one. The combination of the new bridge and an aggressive program to dredge the Tisdale Bypass has increased the effectiveness of the weir system by one-third. In March of 2009 water flowed across the weir and under the new bridge for the first time.