Terrace, also known as Alamosa River Reservoir, is a privately-owned irrigation structure located in Conejos County, Colorado. Built in 1912 by the USDA NRCS, this Earth-type dam stands at a height of 166 feet and has a hydraulic height of 182 feet, providing crucial water storage for the region. With a storage capacity of 19,195 acre-feet and a surface area of 300 acres, Terrace plays a vital role in supporting agricultural activities along the Alamosa River.

Managed by the Colorado Division of Water Resources, Terrace is subject to state regulation, inspection, and enforcement to ensure its safety and compliance with standards. The dam's spillway, classified as uncontrolled, has a width of 138 feet to manage potential overflow during high-discharge events. Despite being assessed as in fair condition during the last inspection in October 2020, Terrace has a high hazard potential, highlighting the importance of ongoing monitoring and maintenance to mitigate risks to downstream communities.

Terrace's strategic location and design make it a critical water resource infrastructure in the region, with a moderate risk assessment rating. As water resource and climate enthusiasts, understanding the role of structures like Terrace in sustaining irrigation and water supply systems is essential for promoting resilience and sustainable management practices in the face of changing environmental conditions.