You're All Cracked Up: Eleven Hour Gulch
 🚙 US-14A Mileage9.2                                                    GPS Coordinates N 44.26.619  W 103.54.704    4,796 ft.
You're All Cracked Up Update2.pdfLesson Guide: PRINT
Field Exploration
Eleven Hour Gulch – the hidden gem of Spearfish Canyon. Because of its slot-like form and steep, vertical walls, sunlight reaches its boulder-strewn depths for only a few moments each day. In this exciting exploration we'll take you into this rocky chasm and delve into the story of its formation as well as the geology behind its dramatic form and appearance.Â
Please review the safety advisories in the Lesson Guide and Use great caution should you decide to enter!
This pdf document contains the specific directions for reaching our featured Lesson Site as well as a detailed explanation of its geologic story. Mileage to the site as well as its specific coordinates are listed on the header above and also in the lesson document. Roadmaps and other learning aids can be found at the Lesson Resources link in the menu and are helpful to have handy in the field. Please print this document and take it with you or read it thoroughly before departing. Exercise extreme caution at the lesson site and along roadways.
Are you ready. . . . Let's Go!
S. V. Fogarty  &  W. R. Stevens
*Mileage starts at the intersection Colorado Bvd. and US 14A near Spearfish.
Eleven Hour Gulch access point. Parking is located just out of the photo in the lower left corner. EXERCISE EXTREME CAUTION when crossing roadway!
A chaotic assortment of boulders greet your entry into the gulch. EXERCISE EXTREME CAUTION if you decide to enter! Do not do so if you are not completely comfortable with hands and feet scrambling on slippery, unstable surfaces.
The Narrows
As one proceeds upstream through the gulch its vertical, igneous rock walls begin to narrow until eventually the chasm closes completely.
 Continuation beyond this photographic point is not advised.Â
Eleven Hour Gulch (Fault?) viewed at 120ft. above road level. Note the linear trend of the gulch and its relatively smooth walls. Earthquake??
Looking back toward the highway along a smooth, vertical rock face.Â
The gulch follows a narrow and linear course throughout in its entire lower reaches.
Gulch Map Annotated.pdfGulch Topographic Map. Print out for use at Lesson Site.
Be sure to download our Onsite Geology Lesson PDF posted above for a detailed geologic investigation of this site.Â
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