Allyn Dam, located in Holt, Nebraska, was completed in 1968 by the USDA NRCS with the primary purpose of flood risk reduction along the Niobrara River. This private-owned earth dam stands at a height of 25 feet and has a length of 1042 feet, providing a storage capacity of 138 acre-feet and covering a surface area of 8 acres. The dam is regulated and inspected by the Nebraska Department of Natural Resources, ensuring its structural integrity and compliance with state regulations.

Despite its low hazard potential and fair condition assessment, Allyn Dam plays a crucial role in mitigating flood risks in the region. With a maximum discharge capacity of 826 cubic feet per second, the dam helps protect surrounding areas from potential flooding events. The dam's stone core and soil foundation contribute to its stability, while its location in SES8T33R15W makes it a key feature in the flood control infrastructure of the St. Paul District.

Overall, Allyn Dam serves as a vital asset in water resource management and climate resilience efforts in Nebraska. With its history of successful flood risk reduction and ongoing state regulation and inspection, the dam remains a key component in ensuring the safety and protection of communities along the Niobrara River. As a testament to its importance, the dam continues to be maintained and monitored to uphold its role in safeguarding against potential flooding disasters.