Rock is a privately owned earth dam located in Fremont, Wyoming, designed by Bradley R. Mortensen and completed in 1978 for flood risk reduction on the off-channel tributary of Antelope Creek. The dam stands at a structural height of 30 feet and has a hydraulic height of 25 feet, with a length of 550 feet and a storage capacity of 48 acre-feet. Despite its low hazard potential and fair condition assessment, Rock is regulated, permitted, inspected, and enforced by the Wyoming State Engineer's Office to ensure its safety and functionality.

With its uncontrolled spillway and one outlet gate, Rock serves as a crucial flood risk reduction structure in the area, providing protection to the surrounding community along HWY 287/789. The dam's primary purpose is flood risk reduction, and it is state-regulated, with regular inspections conducted every five years to assess its condition. Although the dam has a moderate risk assessment rating of 3, Rock meets regulatory guidelines and is equipped to handle potential emergencies through an emergency action plan.

Located in Congressional District 00 of Wyoming, Rock is a vital part of the state's infrastructure for managing water resources and mitigating flood risks in the region. As climate change continues to impact water availability and extreme weather events, the maintenance and proper functioning of structures like Rock are essential for ensuring the safety and resilience of communities in the face of changing environmental conditions.