Hat Creek Radio Observatory 
42231 Bidwell Rd.
Hat Creek, CA 96040
530-335-2364
https://www.sri.com/location/hat-creek-radio-observatory/
Observatory: Science, Walk
Hat Creek Radio Observatory (HCRO) is a research facility used to study radio emission from space. The observatory has been here nearly half a century (since 1959). Hat Creek Valley is an ideal site for radio astronomy because of its relatively low levels of man-made radio interference. The observatory is surrounded by volcanic mountains that keep out terrestrial radio interference like television, radio and cellular phone transmissions.