Public domain
RECLAMATION, BUREAU OF. ARROWCOCK DAM, BOISE, IDAHO, SHOWING TUNNEL WHICH CARRIES BOISE RIVER DURING CONSTRUCTION
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineRECLAMATION, BUREAU OF. ARROWCOCK DAM, BOISE, IDAHO, SHOWING TUNNEL WHICH CARRIES BOISE RIVER DURING CONSTRUCTION. 1912-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.