METHOD OF MEASUREMENT: Low flows measured by wading. High flows measured from footbridge 100 feet from station.
DRAINAGE AREA: 35.95 square miles.
LOCATION: On the west bank and upstream of Merced Avenue approximately 150 feet, approximately one-half mile above the junction with Walnut Wash and approximately one mile south of City of Baldwin Park.
REGULATION: Partly regulated by Big Dalton Dam, San Dimas Dam, Puddingstone Diversion Dam, Big Dalton Spreading Grounds, Little Dalton Spreading Grounds, Big Dalton Debris Basin, Little Debris Basin and irwindale Spreading Grounds.
CHANNEL: Concrete, rectangular section.
CONTROL: Channel forms control.
LENGTH OF RECORD:
REMARKS: Flow may include imported water originating from San Dimas.