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Donlon Road Realignment

Somis, California

Stream Crossing

Owner:

County of Ventura

Engineer:

MNS Engineers, Inc.

Contractor:

Toro Construction

Installation:

September 28, 2015

In order to alleviate traffic congestion and improve safety at the intersection of Donlon Road and SR 118 in the town of Somis in Ventura County, California, Donlon Road needed to be realigned. The project included the construction of wider eight-foot shoulders, longer left-turn pockets on SR 118 in both directions, new guard rails and a bridge spanning Coyote Canyon Creek.

Donlon Road was moved 200 feet to the west to provide a standard four-way intersection at SR 34 (Somis Road) and SR 118, with the original intersection being closed. To meet this need, the Ventura County Public Works Agency's Department of Transportation (Ventura County) worked with Contech Engineered Solutions to select a prefabricated bridge.

Chris Hooke, Deputy Director with Ventura County stated, "We chose a pre-fabricated bridge because we wanted speed of construction, economy, and options to meet the hydraulic requirements.

As the best solution for the stream crossing, Ventura County selected a 30' x 12' CON/SPAN® O-Series® Bridge System, 64' in length. The eight precast bridge units, with precast headwalls and wingwalls, offered the most advantages over other options, including material and economic efficiency, the ability to meet hydraulic requirements, engineering support, and the speed of precast materials.

"Contech worked closely with us and provided excellent drawings and specifications which simplified our design effort," added Hooke. "The bids were reasonable and construction of the structure went very smoothly. The entire system was set in just two days and everything fit as it was supposed to. Contech's continuous engineering support during construction was very helpful. We are very happy with the outcome, and we will use Contech again."

"Contech was easy to work with during design and responsive during construction," concluded Michael Ip, P.E., Principal Engineer with MNS Engineers, Inc., the engineer on the project.

Technical Description:

• Span: 30’
• Rise: 11’ - 11 7/8"
• Length: 64’

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