Immerse yourself in one of the longest caves in the world. With over 220 miles
of mapped and surveyed passages, this underground wilderness appeals to human
curiosity. Its splendor is revealed through fragile formations and glimpses of
brilliant color. Its maze of passages lures explorers, and its scientific
wealth remains a mystery. This resource is truly a jewel in the National Park
Service.

Immerse yourself in one of the longest caves in the world. With over 220 miles of mapped and surveyed passages, this underground wilderness appeals to human curiosity. Its splendor is revealed through fragile formations and glimpses of brilliant color. Its maze of passages lures explorers, and its scientific wealth remains a mystery. This resource is truly a jewel in the National Park Service.

Bird's eye view of the park

Jewel Cave National Monument

Deerfield Dam and Reservoir, Rapid Valley Project, are twenty-five miles west
of Rapid City, South Dakota on Castle Creek. Reservoir contains 400 surface
acres and has 16 miles of shoreline. Public use area, camping, picnic areas,
concession, swimming, boating, hiking, and fishing. Available species include
rainbow trout, brown trout, and rock bass. Open year-round. Current Reservoir
Levels.

<a href="http://www.usbr.gov/dataweb/dams/sd01138.htm" rel="nofollow">Deerfield Dam</a> and Reservoir, <a href="http://www.usbr.gov/dataweb/html/rapidvly.html" rel="nofollow">Rapid Valley Project</a>, are twenty-five miles west of Rapid City, South Dakota on Castle Creek.  Reservoir contains 400 surface acres and has 16 miles of shoreline. Public use area, camping, picnic areas, concession, swimming, boating, hiking, and fishing. Available species include rainbow trout, brown trout, and rock bass. Open year-round. <a href="http://www.usbr.gov/gp-bin/arcweb_dfr.pl" rel="nofollow">Current Reservoir Levels</a>.

Jewel Cave National Monument

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Nearby Parks

Deerfield Reservoir