• Explore and Discover One of the Last Frontiers in the World ...

    Jewel Cave

    National Monument South Dakota

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  • Caution - Roadwork on Highway 16

    Construction projects both along highway 16 and the Jewel Cave parking lot are in progress. The Jewel Cave Visitor Center is open daily from 8:30 a.m. to 4:30 p.m. with tours scheduled throughout the day. No reservations for cave tours.

  • Highway 16 construction near Jewel Cave entrance

    Construction of Highway 16 through Jewel Cave National Monument is progressing on schedule. Motorists should use caution while traveling through the construction zone. Visitors to Jewel Cave should plan extra travel time and come early in the day. More »

  • The parking lot at Jewel Cave takes shape

    Jewel Cave's parking lot project is on schedule for completion this fall. The stairs and wheelchair ramp to the visitor center are under construction. Signage along a service road and staff assistance will help guide visitors to the visitor center. More »

Public Involvement

South Dakota Department of Transportation
Notice of Approval of Environmental Assessment
for Public Availability

US Highway 16
SDDOT Project No. NH 0016(72)11, PCN 022E
Custer County, SD

The Federal Highway Administration has approved the above project’s Environmental Assessment and Section 4(f) Evaluation for public availability. The document discusses the Environmental Assessment and Section 4(f) Evaluation for the segment of US16 from 1 mile West of Jewel Cave National Monument to 0.5 miles East of Jewel Cave National Monument.

Copies of the Environmental Assessment are available for review at the following offices:

SD Department of Transportation
Environmental Office (Room 312)
700 E. Broadway Ave.
Pierre, SD 57501

SD Department of Transportation
Custer Area Office
PO Box 431
Custer, SD 57730-0431

The document is also available for download from


For further information regarding this project, contact Tom Lehmkuhl, SDDOT at (605) 773-3180. Comments on this Environmental Assessment should be submitted by August 28, 2013 to:

Tom Lehmkuhl, Environmental Engineer
South Dakota Department of Transportation
700 East Broadway Avenue
Pierre, SD 57501-2586

Dated in Pierre, South Dakota this 19th day of July, 2013.
(Published twice at the total approximate cost of $____.___)

Did You Know?

Entrance to Jewel Cave

Jewel Cave has only one natural entrance. Although the cave is more than 160 miles long, it lies beneath just 3 square miles of land area.