G.W. Verhoeff is a privately owned irrigation dam located in Lamar, Colorado, within Bent County. Constructed in 1947 by the USDA NRCS, this earth dam stands at a height of 18 feet and has a hydraulic height of 20 feet. With a capacity of 542 acre-feet, it primarily serves the purpose of irrigation for the surrounding area, with additional uses including fire protection, stock watering, and small fish pond support.

Situated on the Arkansas River-TR, G.W. Verhoeff spans 964 feet in length and covers a surface area of 52 acres. Despite its low hazard potential, it has been rated as fair in condition assessment, with the last inspection conducted in October 2010. The dam has a normal storage capacity of 230 acre-feet and a maximum discharge rate of 14,745 cubic feet per second, ensuring effective water resource management for the region.

Managed by the Natural Resources Conservation Service, G.W. Verhoeff is subject to state regulations and inspections, with the Colorado Division of Water Resources overseeing its permitting, enforcement, and enforcement. While the dam's risk assessment indicates a high level of vulnerability, measures for risk management and emergency preparedness are yet to be fully implemented. For water resource and climate enthusiasts, this dam serves as a significant infrastructure for irrigation and environmental conservation in the region.