Blackhawk Lake, also known as Hait Dam (Upper), is a privately owned reservoir located in Valley County, Idaho. This dam on Duffner Creek, a tributary of the North Fork Payette River, was completed in 1968 for irrigation purposes. The earth dam stands at a height of 44.8 feet and has a hydraulic height of 39.5 feet, with a storage capacity of 1630 acre-feet and a surface area of 95 acres.

With a significant hazard potential and fair condition assessment, Blackhawk Lake is regulated by the Idaho Department of Water Resources. The dam features an uncontrolled spillway and slide gates for water release, with the last inspection conducted in May 2017. The risk assessment for the dam rates it as moderate, highlighting the importance of ongoing monitoring and maintenance to ensure the safety of the surrounding community and water resources in the area.

Blackhawk Lake serves as a vital water resource for irrigation in the region, supporting agricultural activities and providing water storage for the local community. Located in a picturesque setting near Payette River, this dam underscores the importance of sustainable water management practices in the face of changing climate conditions. Enthusiasts of water resources and climate will find Blackhawk Lake to be a fascinating example of human-built infrastructure interacting with the natural environment in a dynamic and critical way.