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Advance Planning Studies

San Jacinto SPUI

The structure work for the Railroad SPUI APS involves the construction of two new bridges for the northbound on-ramp and southbound off-ramp that will connect towards the end of the current San Jacinto River Bridge. These bridges will be 3 span bridges with 2 piers each.

With the change to the geometric design of these two ramps, the construction of these bridges is necessary since they no longer merge with the I-15 at their current locations.

A link to the full San Jacinto SPUI APS is at the bottom of the page. Listed below are portions of that APS that highlight the structural changes.

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Plan View

This shows the plan view of the San Jacinto SPUI APS, the San Jacinto River (though not depicted) runs up and down and the I-15 bridges cross over horizontally. Looking at the legend, the new ramp bridges are shown with bold lines, the existing I-15 bridges are shown with dashed lines, and the future widening for the ultimate buildout of the I-15 is shown with a hatch.


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Elevation View

This is the elevation view of the San Jacinto SPUI APS, the new ramp bridges are shown at the top with their abutments on the left and right and their two piers in the middle.


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Typical Section Views

Northbound On-Ramp Typical Section View

This is a typical section view of the new northbound on-ramp bridge, the precast prestressed box girder section is shown on top (labeled as such) and the pier is below it. This bridge has a depth of 8'-0".


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Typical Section Views

Southbound Off-Ramp Typical Section View

This is a typical section view of the new southbound off-ramp bridge, the precast prestressed box girder section is on top (labeled as such) and the pier is below it. This bridge has a depth of 6'-3".

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Cost Estimate

The cost estimate of the structure work of adding the retaining walls and the construction of the new I-15 bridges crossing over Railroad Canyon Road and the San Jacinto riverbed for the SPUI alternative is $42 million.

Key Points

The new northbound on-ramp bridge in this design is a precast prestressed box girder bridge with a total length of 479'-3" containing 3 spans of lengths: 150'-5", 177'-3", and 151'-7". The bridge has 2 piers and has open seat abutments with H-piles. It has a depth of 8'-0", a width varying from 39'-8" to 51'-8", and a bridge area of 21,700 ft2.

The new southbound off-ramp bridge in this design is a precast prestressed box girder bridge with a total length of 376'-11" containing 3 spans of lengths: 120'-3", 135'-11", and 120'-9". The bridge has 2 piers and has open seat abutments with H-piles. It has a depth of 6'-3", a width of 27'-6", and a bridge area of 8,800 ft2.