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"No. 190. Grand Valley Diversion Dam. Diversion gates, water flowing into high line. June, 1917. R.B.D." - Grand Valley Diversion Dam

Library of Congress, via Wikimedia Commons · June 1917 · U.S. Reclamation Service (R.B.D.), copied by the Historic American Engineering Record

A print mounted on black card: water pours through the diversion gates beneath a concrete bridge deck into a canal, beside a tile-roofed gatehouse lettered GRAND RIVER DIVERSION DAM, with canyon cliffs behind.
From the archive · Library of Congress, via Wikimedia Commons · June 1917 "No. 190. Grand Valley Diversion Dam. Diversion gates, water flowing into high line. June, 1917. R.B.D." - Grand Valley Diversion Dam U.S. Reclamation Service (R.B.D.), copied by the Historic American Engineering Record

Historic American Engineering Record, Library of Congress, Prints & Photographs Division, HAER CO-90-49 (photographic copy of a 1917 U.S. Reclamation Service print); via Wikimedia Commons No known restrictions on publication. Archive record ↗ · Rights

Source Archival record · verify at Library of Congress, via Wikimedia Commons ↗

June 1917, the dam's second season: water flowing through the diversion gates into the Highline. The gatehouse still carries the river's old name, Grand River.

Shows: The canal headworks in operation a year after completion, and the original signage.

What this does not let you conclude: Today's diversion; the number beside it is DWR's current record. The date is on the original Reclamation Service print, copied by HAER (HAER CO-90-49).

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