The Princeton Dam located on the upper Fox River in Green Lake County has been considered for improvements for many years due to safety concerns related to the placement and removal of flashboards across the 200 foot river channel. Several years ago, a near fatal accident pushed the Wisconsin Department of Natural Resources to finally seek a resolution. The Princeton Dam regulates water levels on Lake Puckaway located upstream of the dam. The existing dam is a submerged rock filled timber crib dam built over 100 years ago as part of the river navigation system. The improvements included a 16.5 inch concrete cap installed on to the existing dam spillway in order to eliminate the need for installing flash boards across the river. Other improvements included a fish passage structure to allow fish to move up and down across the dam. The former navigation lock located on the north shore is now used for lowering the impoundment levels using five, 8’ wide by 6’ high slide gates that were replaced as part of this project. Janke Construction was the contractor and the construction cost was $2M.