Mill Creek Dam checkbox The first dam was constructed in 1936 and took several months with over 300 men working to complete. pencil The spring filled the basin in 44 days. tree April 29, 1947-A flash flood did too much damage and a new damn had to be built. The idea of first building a dam was entertained in 1912, but it wasn't until 1935 that the idea gained enough support. All Photos taken from Paullina Gem of the Prairie book #991 at Paullina City Hall