Angostura Reservoir

A closer look at Angostura Reservoir

Its coordinates are 43.3058, -103.4343. The deepest point on record is about 75 feet. The Cheyenne River carries the outflow. Surface elevation is about 3,127 feet.

Many smaller lakes have no designated beach at all, only informal shoreline access. Pactola Point Swim Beach, on Pactola Reservoir, is the closest named beach in this guide, about 52 miles off. The federal and state datasets behind this guide list no named beach at Angostura Reservoir. That does not mean there is no access, only that none is catalogued.

Angostura Reservoir has no public water level gauge that we can read, so there is no level chart here. An invented number would be worse than none. For a lake this size, the park office is the fastest way to learn how the water sits today.

Inland lakes are not monitored the way ocean beaches are, so posted signs matter more here. Water temperature is not measured at this lake by any public agency we read. Season dates vary by park; the operating agency publishes them each spring.

The closest lakes in this guide are Deerfield Reservoir (South Dakota, 53 mi), Pactola Reservoir (South Dakota, 53 mi) and Box Butte Reservoir (Nebraska, 61 mi). In all, 11 lakes in South Dakota are covered here.