In general, the office is open 8:30 a.m. to 4:30 p.m. Monday through Friday. Holidays are an exception. It is a very good idea to call ahead unless you are planning a self-guided visit of the area. The property is gated and there is no vehicle access when the office is closed. Visitors may access walking trails from the parking lot daily from sunrise to sunset. Click here to check the real time USGS water gauge at Kelley's Slab.