Flood Waters Flood waters force closure of the Locks and Dams 3 on the Monongahela River in Elizabeth, Pa., March 1, 2021. High water from snow melts and extended rain affected the U.S. Army Corps of Engineers Pittsburgh District on the Monongahela River. SHARE: Download: Full Size (1 MB) Credit: Philip Delo, U.S. Army Corps of Engineers Pittsburgh District VIRIN: 210301-A-XX123-004C.JPG Photo Gallery