Granite Lake, also known as Upper Granite Lake, is a privately owned reservoir located in McCall, Idaho. The dam was completed in 1949 for irrigation purposes, with a primary dam type of earth and core types of stone. The dam stands at a height of 24.8 feet with a hydraulic height of 20.5 feet, creating a storage capacity of 2900 acre-feet and covering a surface area of 195 acres. The reservoir is fed by Lake Creek East Fork and Fisher Creek, with a drainage area of 2.19 square miles.

The dam at Granite Lake is regulated by the Idaho Department of Water Resources, with state permitting, inspection, and enforcement in place. The spillway, which is uncontrolled, has a width of 10 feet and a maximum discharge capacity of 73 cubic feet per second. The dam has been assessed to have a significant hazard potential and is currently in fair condition as of the last inspection in July 2018. The risk assessment for Granite Lake is moderate, with a risk management plan in place to address any potential issues.

Located in the beautiful Valley County, Idaho, Granite Lake offers a vital water resource for irrigation in the region. As a key component of the local water infrastructure, this reservoir plays a crucial role in supporting agricultural activities in the area. With its picturesque setting and important function, Granite Lake serves as a fascinating site for water resource and climate enthusiasts to explore and study.