Pleasant Valley, also known as Terry Lake, is a private water resource located in Boulder, Colorado. This reservoir serves multiple purposes including irrigation, recreation, and water supply, with a primary focus on irrigation. The dam was completed in 1868 and stands at a height of 19 feet, with a storage capacity of 4,707 acre-feet and a surface area of 334 acres.

The reservoir is regulated by the Colorado Department of Water Resources and undergoes regular inspections to ensure its safety and functionality. With a high hazard potential but a satisfactory condition assessment, Pleasant Valley provides essential water resources for the surrounding area. The spillway, with a width of 462 feet, is uncontrolled, and the reservoir has a maximum discharge rate of 2,403 cubic feet per second.

Despite its age, Pleasant Valley continues to play a vital role in water management in the region. Climate enthusiasts will appreciate the history and significance of this reservoir in sustaining agricultural activities and recreational opportunities in the area. Its location along the St. Vrain Creek adds to its importance as a water source for both local communities and the environment.