City of Chico says that work on the 20th st bike/pedistrian bridge will begin tonight and work will continue in the overnight hours thru February. Cal trans Offcials say you can Expect closures of the North and Southbound off ramps on Hiway 99 at 20th st. each night from 10p thru 7am daily Local street detours will be provided during the full closure hours to minimize disruptions. Night closures may continue after February to allow the contractor to install additional arichitectural lights safely and for the placement of the bridge deck concrete. The project is expected to be fully completed by the Fall .