Cove Fort Summit

Cove Fort Summit is the climb over the high point of I-15 in Utah, the pass south of Cove Fort between Manderfield and Sulphurdale. The crest sits at milepost 124.8, elevation 6,611 ft, the highest point on I-15 anywhere in the state (Wikipedia, "Interstate 15 in Utah"). There is no official signed name for this pass. Sources call it an unnamed mountain pass, and "Cove Fort Summit" describes the run up to the Cove Fort junction rather than a labeled summit on a green sign.

That junction is the reason most truckers know this spot. At Exit 132, near the Beaver/Millard county line, I-70 splits off and runs east toward Richfield, the San Rafael Swell, and eventually Denver. I-70's western terminus is right here, milepost 0.000 (Wikipedia, "Interstate 70 in Utah"). For a driver, Exit 132 is the decision point: stay on I-15 north toward Fillmore, Nephi, and Salt Lake, hold I-15 south toward Beaver and the Cedar City/St. George region, or turn east on I-70.

The bigger story is weather. This is exposed high desert at over 6,000 ft, and the stretch between Beaver and Cove Fort closes on short notice in winter. Snow squalls drop visibility to near zero in minutes, ice takes out semis on the grade, and crosswinds tip high-profile and empty trailers. None of it runs on a schedule. Treat this corridor as one that can shut for hours with little warning from October into spring.

• Summit crest sits at milepost 124.8, elevation 6,611 ft, the highest point on I-15 in all of Utah (Wikipedia, "Interstate 15 in Utah")
• The pass is unnamed in the sources; it lies south of Cove Fort between Manderfield and Sulphurdale
• I-70 meets I-15 at Exit 132 near the Beaver/Millard county line; this is I-70's western terminus at milepost 0.000 (Wikipedia, "Interstate 70 in Utah")
• AARoads documents a 5% grade between Bull Hollow and Mud Spring Hollow and summits around 6,500 to 6,600 ft in this corridor (AARoads)
• Truck climbing lanes run over Beaver Ridge, roughly mileposts 98 to 105, a separate climb south of the Cove Fort summit (UDOT Beaver Ridge Climbing Lanes Project)
• Utah's statewide Traction Law (Utah Admin. Code R920-6) is condition-activated and announced by signs and UDOT traveler info, not a fixed Cove Fort chain station
• Commercial vehicles must carry chains October 1 to April 30 or when UDOT determines conditions warrant (Utah Admin. Code R920-6)

Utah does not publish a fixed Cove Fort chain-control season. The state runs a statewide Traction Law under Utah Administrative Code R920-6, activated by conditions and announced through signage and UDOT traveler information. Commercial vehicles must carry chains from October 1 through April 30, or whenever UDOT determines conditions warrant (Utah Admin. Code R920-6). When the Traction Law is in force, a commercial vehicle with four or more drive wheels (other than a bus) must chain at least four drive-wheel tires; buses and RVs chain at least two. Utah uses two segment classes: a Class 1 segment requires vehicles over 12,000 lb GVW to be traction-device equipped, and a Class 2 segment requires all vehicles to be traction-equipped or 4WD (UDOT, "Snow Tire & Chain Requirements"; R920-6). Because the rule is condition-activated and corridor-wide, the chain requirement here switches on and off with the weather rather than closing on a calendar date.

Cove Fort itself predates the interstate by a century. Ira Hinckley built the fort in 1867 at Brigham Young's request, a fortified way station roughly halfway between Fillmore, the former territorial capital, and Beaver. It sat on the main north-south pioneer corridor that carried the stagecoach, the Pony Express, and the telegraph, the same line I-15 now follows (FHWA, "Why Does I-70 End in Cove Fort, Utah?"; Wikipedia, "Cove Fort"). The Hinckley families bought the fort and gave it back to the LDS Church in 1988, and Gordon B. Hinckley dedicated the restored fort on May 9, 1992 (Wikipedia, "Cove Fort").

The interstate junction came later. On October 18, 1957, U.S. Secretary of Commerce Sinclair Weeks announced that I-70 would extend west from Denver and bend south to end at I-15, making Cove Fort the future western terminus. The decision reportedly caught Utah officials off guard (FHWA). A 70-mile two-lane stretch of I-70 through the San Rafael Swell opened on November 5, 1970, and Utah completed the four-lane segment on September 28, 1990, finishing the I-70/I-15 connection at Cove Fort (FHWA).