Concord police are looking for the driver of a black 2015-16 Honda Civic which kept going north on I680 after striking a bicyclist at Diamond Boulevard and Willow Pass Road Wednesday.
The collision was reported at 9:44 p.m. Police closed the location of the crash for several hours Wednesday in order to facilitate their investigation.
The bicyclist, a 39 year old man, was transported to a nearby hospital and is listed in critical condition.
Police say the Civic should have extensive front end and windshield damage. The driver is described preliminarily as a female with dark hair.