Michigan Bar No. 1 is a significant earth dam located in Rancho Murieta, Sacramento, California, along the Tr Cosumnes River. Built in 1989, it serves as a crucial water supply infrastructure managed by a public utility in the state. The dam stands at a height of 17 feet with a hydraulic height of 14.6 feet, storing up to 814 acre-feet of water and covering a surface area of 34 acres.

This dam plays a vital role in flood risk reduction, irrigation, and water supply in the region, demonstrating its importance for water resource management in California. It is regulated, permitted, inspected, and enforced by the California Department of Water Resources (DWR) under the Safety of Dams program. Despite being classified as having a significant hazard potential, Michigan Bar No. 1 is currently in satisfactory condition, as assessed in September 2017.

With its last inspection conducted in February 2021, Michigan Bar No. 1 continues to meet safety guidelines and serves as a key piece of infrastructure for water management in the area. As a crucial component of the state's water supply system, this dam exemplifies the importance of maintaining and monitoring water resources in the face of changing climate conditions and increasing water demands.