Haystack is a federal-owned dam located in Oregon, specifically in Jefferson County near the city of Madras. Built in 1956 by the Bureau of Reclamation, this earth dam stands at a height of 105 feet and serves primarily for irrigation purposes, with a storage capacity of 7350 acre-feet. The dam, situated on Haystack Creek OS, has a structural height of 102 feet and a hydraulic height of 74 feet, covering a surface area of 280 acres and draining a 10 square mile watershed.

Despite its age, Haystack dam remains an essential water resource infrastructure in the region, with a high hazard potential and risk assessment rating of 2. The dam lacks a spillway and outlet gates, posing challenges in managing excess water flow during peak periods. Although the condition assessment is not available, the Bureau of Reclamation oversees inspections and operations to ensure the safety and functionality of the structure. With its significant storage capacity and critical role in supporting irrigation needs, Haystack dam continues to be a vital asset in water management and climate resilience efforts in the area.