The Official Town Council and Planning Group of Tierrasanta

Home Up design option 1 Bridge Design path option 2, 2a Path Option 2a option 3 citizen option
The discussion below (Alignment and Typical Section and Conclusions) and the options 1, 2-2A, and 3 web page discussions are extracted from the "Feasibility Study For Tierrasanta Blvd. Bicycle Path Extension in the City of San Diego". Submitted to the City Of San Diego on February 26, 2001. Submitted by Darnell & Associates, Inc. In addition, aerial photos provided by the San Diego City Traffic Engineering Division with bike path overlays are included.

  ALIGNMENT AND TYPICAL SECTION (page 4 of the study)

Lintvedt, McColl & Associates developed the alignment and design options for the proposed Tierrasanta Bikeway.

Proposed –Alignment

A field survey was conducted of the existing area to determine the best location for the proposed bikeway with consideration given to the steep grades and potential environmental impacts to the San Diego River. Using the information obtained from the field review SANGIS maps, and other City Maps and Records, four design options were developed. Each of the options are discussed on the following pages

All four alignment designs use the same bridge location and length and have 400 feet of bike path construction  South of the San Diego River. The construction of the bridge will require 24,000 square feet of environmental mitigation. The minimum curve radius used in each design option was 75 feet, and the maximum grade in all designs was held to 5 percent.

  CONCLUSIONS (page 21 of the study)

 

  • The proposed Tierrasanta Boulevard Bikeway Extension would extend south of Tierrasanta Boulevard over the San Diego River joining up with Princess View and Mission Gorge Road.

  • The four design options for the proposed Tierrasanta Bikeway meet the minimum design standards set by CALTRANS.

  • Alignment Option 2A provides the flattest overall grades, while Option 3 makes more use of the maximum 5% grade. Options 1 and 2 have steeper grades than Option 2A but has more gradual grades than Option 3.

  • All four alignment options are designed with regards to visual aesthetics.

  • It is recommended that the bridge be constructed with 7 spans, each 68 feet long. This will place columns within the river bed but will allow the use of simple supported prefabricated steel bow truss superstructures.

  • The construction of the bridge across the San Diego River will require approximately 24,000 square feet of environmental mitigation.

  • Since Design Option 3 uses land that is dedicated to open space, it will require 60,000 square feet of environmental mitigation required by bridge construction.

  • Alignment Option 2 and 2A are located to the east and west of the Tierrasanta Boulevard right-of-way from the J. J. B. Land Company. Option 2A will require land to be acquired from the Navy, which may prove to be difficult.

  • The Tierrasanta Bikeway will impact sensitive upland and wetland resources, including habitant for the threatened California gnatcatcher and potential habitant for other endangered species associated with the riparian habitat in the San Diego River.

  • Permits would be required from the Army Corps of Engineers, Regional Water Quality Control Board, California Coastal Commission, California Department of Fish and Game, and the City of San Diego.

  • Two potentially significant cultural resources are known within the project area of potential effect.

  • Option 2A has the lowest overall construction costs -  $4,207,800, and Design Option 1 has the highest estimated costs - $5,136,600.

  • Compatibility with the future construction of Tierrasanta  Boulevard may require that a portion of the bikeway be reconstructed to cross under Tierrasanta Boulevard. The final design should examine this potential.

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