Grassy Trail is a privately owned dam located in Carbon County, Utah, specifically in East Carbon City. It was completed in 1952 and serves the primary purpose of providing water supply. The dam, which is classified as an Earth dam type, stands at a structural height of 89 feet, with a hydraulic height of 81 feet. It has a storage capacity of 1,156 acre-feet and is situated on the Whitmore Canyon Creek, within the Omaha District of the US Army Corps of Engineers.

The dam is considered to have a high hazard potential, but its condition was assessed as fair as of January 2006. Regular inspections are conducted, with the last one taking place in September 2020. The Utah Division of Water Rights regulates and inspects the dam, ensuring that it meets state safety standards. Although the dam has not undergone significant modifications in recent years, it remains a critical water infrastructure in the region, supporting the local water supply needs and contributing to the management of the surrounding drainage area.

Water resource and climate enthusiasts will find Grassy Trail to be an essential component of the water supply infrastructure in Carbon County, Utah. Its presence on the Whitmore Canyon Creek showcases the importance of dams in managing water resources in arid regions. The dam's storage capacity, inspection frequency, and regulatory oversight by the Utah Division of Water Rights highlight its significance in ensuring the safety and reliability of water supply for the residents of East Carbon City and beyond.