A frequently used on-ramp will be closed in Chico Monday night.
The northbound Highway 99 on-ramp from Highway 32 will be closed from 9:00 p.m. until 6:00 a.m. Tuesday morning.
The ramp was also closed Monday afternoon while crews did striping work.
A detour is in place.
Drivers can take southbound Highway 99 to E. 20th St. and get back onto northbound Highway 99.