Simon #1, also known as Crosho, is a privately owned irrigation dam located in Oak Creek, Colorado. Completed in 1917, this earth dam stands at a height of 27 feet and has a storage capacity of 1,696 acre-feet, making it an essential water resource for the area. The dam controls the Middle Hunt Creek-OS river and has a spillway width of 12 feet.

Managed by the Colorado Department of Water Resources, Simon #1 is subject to state regulation, inspection, and enforcement to ensure its safety and functionality. Despite being classified as having a low hazard potential and fair condition assessment, the dam is monitored regularly, with the last inspection taking place in June 2014. With a moderate risk assessment rating, measures are in place to manage any potential risks associated with the dam.

For water resource and climate enthusiasts, Simon #1 offers a fascinating glimpse into the history and infrastructure of water management in Colorado. Its role in irrigation and water storage highlights the importance of maintaining and regulating such structures to ensure the sustainable use of water resources in the region.