THE CONCRETE BRIDGE MAGAZINE

FALL 2012

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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Black Canyon Road passes through Cleveland National Forest in San Diego County, Calif., and serves as the main access point between the Mesa Grande Band of Mission Indians Reservation and the unincorporated community of Ramona. The Black Canyon Road Bridge spans a steep canyon over Santa Ysabel Creek downstream of Sutherland Dam and provides an aesthetically pleasing structure. Geometry Black Canyon Road Bridge is a two- span, cast-in-place, conventionally reinforced, concrete box girder bridge that carries two lanes of traffic on a tight 150-ft-radius horizontal curve. It is 175 ft long, typically 28 ft wide, and has no sidewalks. The midpoint p i e r c o n s i s t s o f t w o 4 - f t - w i d e , o c t a g o n a l c o l u m n s w i t h a c l e a r height of about 20 ft. The columns are supported by two 8 ft 6 in.-square by 3-ft-thick footings that are formed into the underlying rock layer. Five, 3-ft-diameter, cast-in, drilled-hole (CIDH) piles support each abutment, and the extension at abutment 1 is supported by an additional four, 3-ft-diameter CIDH piles. The CIDH piles have nine, two-bar bundles of No. 8 longitudinal bars and No. 5 profile BLACK CANyON ROAD BRIDGE / SAN DIEGO COUNTY, CALIFORNIA BRIDGE DESIGN ENGINEER: NV5 Inc., San Diego, Calif. CIVIL DESIGN ENGINEER: Southern California Soil & Testing Inc., San Diego, Calif. PRIME CONTRACTOR: Weir Construction Corporation, Escondido, Calif. CAST-IN PLACE CONCRETE SUPPLIER: Vulcan Materials Company, Chula Vista, Calif. by Christopher Krier and Jack Abcarius, NV5 Inc. Black CANyON ROAD BRIDGE This is a view of Black Canyon Road Bridge from the north. Photo: NV5 Inc. 34 | ASPIRE , Fall 2012 P R O J E C T AspireBook_Fall12.indb 34 9/18/12 8:58 AM

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