Horrocks conducted an Environmental Impact Statement (EIS) to evaluate transportation and safety needs at the I- 80 and State Street Interchange in South Salt Lake City, Utah. Key elements of the EIS included purpose and need, preliminary design and traffic analysis (regional modeling and microsimulation) for over 20 alternatives, GIS data collection and analysis, environmental resource analysis (economics, cultural resources, Section 4(f), noise, and air quality), and coordination with agencies, stakeholders, businesses, and the public. The Selected Alternative included widening the I-80 structure to accommodate an additional lane on State Street and constructing a westbound frontage road between State Street and Main Street to allow for multiple access points to South Salt Lake City.
This portion of Bangerter Highway is an access controlled, four-lane highway that is intended to move high volumes of traffic from the south end of the Salt Lake Valley toward the north end. It is one of only two access controlled north/ south corridors in the valley. In addition to roadway alignment and profile design, Horrocks Engineers also designed 7 structures due to roadway, irrigation, drainage, and other waterway crossings. The project also dealt with many groundwater and wetland issues requiring extensive geotechnical investigation and soils analysis. As a result, measures were taken to stabilize the river banks, prepare for fill settlement, and to delineate and mitigate wetlands including native revetment. Storm drainage facilities were also a major part of the design process. Extensive coordination was required with many local and federal agencies, including the Army Corps of Engineers, Union Pacific Railroad, Draper City, and various canal utility companies. Other design considerations were noise studies, noise wall design, irrigation, utilities, and landscaping.
The Point project will improve mobility and reduce congestion along I-15 between northern Utah County and Draper, specifically from S.R. 92 to 12300 South. As a part of the program management team, Horrocks Engineers helped craft a RFP and preliminary design to help The Utah Department of Transportation (UDOT) reach their goal to select a best-value bidder to widen and place new pavement along this seven-mile stretch of freeway. The project will expand I-15 to six lanes in each direction from SR-92 to 12300 South, replaced aged concrete pavement, replaced bridges and realign the East Frontage Road intersection at the 14600 South interchange in Bluffdale to accommodate future interchange modifications and enhance the existing traffic management system by installing additional ramp meters, fiber optics and other infrastructure to improve mobility. Construction is expected to begin this fall with a target completion date of September 2016.
The CMGC Team of Ralph L. Wadsworth, Horrocks Engineers, and H.W. Lochner, in cooperation with UDOT and FHWA, utilized Accelerated Bridge Construction (ABC) and a reversible barrier system to improve conditions along I-80. ABC was used to replace 12 bridges along the I-80 corridor in a two-month period from late June through early August 2008. Horrocks designed the ABC bridges at 300 East, 500 East, 600 East, 700 East, 900 East, and Highland Drive. This technology reduced roadway closures and the inconvenience to the I-80 commuters. The I-80 project is approximately 1.5 miles of mainline I-80 with 17 bridges, including 14 mainline I-80 bridges, 3 ramp bridges, and over 20 retaining walls. Horrocks Engineers designed all bridges to incorporate using ABC methods. The Horrocks Engineers/RLW Construction CMGC team transported all mainline bridges using Self-Propelled Modular Transporters (SPMTs). All superstructures were constructed in a common casting yard and transported down the corridor to each location.