The Lagerman Trail Boat Ramp is located in Boulder County, Colorado, at a latitude of 40.13550949 and a longitude of -105.19026184. It is a concrete boat ramp that provides access to Union Reservoir, which is a popular recreational area for boating, fishing, and other water activities.

According to the latest information available, the Lagerman Trail Boat Ramp is approximately 30 feet wide, which allows for easy launching and retrieval of boats of various sizes. The reservoir has size restrictions on boats, with a maximum length of 21 feet and a maximum horsepower of 60.

The reservoir is open year-round, weather permitting, and is stocked with a variety of fish species, including largemouth bass, crappie, bluegill, channel catfish, and rainbow trout. Visitors can also enjoy hiking, picnicking, and bird watching in the surrounding area.

Overall, the Lagerman Trail Boat Ramp provides convenient and reliable access to Union Reservoir for boaters and water enthusiasts in Boulder County.