Ralph Leroy Parshall (July 2, 1881, Golden, Colorado - December 29, 1959, Fort Collins, Colorado) engineer. Inventor of a flow-measuring device that became commonly known as the Parshall flume.

Parshall was born in Golden on July 2, 1881. He received his B.S. in civil and irrigation engineering from Colorado Agricultural College (now Colorado State University) in 1904.

• Irrigation in Colorado (January 1, 1927)
• Measuring water in irrigation channel (1941) Catalog Record
• Venturi flume water stage recording instruments, patent no. 1417941 (1922) 10217/40931 Catalog Record

• "Collection at Colorado State". Archived from the original on 2011-08-16.
• "Father of the Flume: Ralph Parshall". Archived from the original on 2012-12-31.
• "Parshall Flume - 1985". ASABE. Archived from the original on 2014-05-19.