Portwine #1 is a privately owned irrigation dam located in Powder River, Montana, along the TR-Bay Horse Creek. Built in 1934, this earth dam stands at 25 feet tall and has a storage capacity of 76 acre-feet, with a normal storage level of 65 acre-feet. The dam serves the primary purpose of irrigation, providing water to support agricultural activities in the region.

Managed by the DNRC and regulated by the state of Montana, Portwine #1 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. With no associated structures and no recent inspection dates provided, the dam remains a key component of the local water resource infrastructure. While it may not be a high-profile location, Portwine #1 plays a vital role in supporting sustainable water management practices in the area.

Although lacking detailed information regarding emergency preparedness and risk assessment measures, Portwine #1 stands as a testament to the historical development of irrigation systems in the region. As water resources and climate enthusiasts, understanding the significance of dams like Portwine #1 can provide valuable insights into the challenges and opportunities associated with managing water resources in a changing climate landscape.