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A soil nail is a type of slope reinforcement. It allows steeper slopes by installing reinforcing bars that are drilled into the ground face and a concrete (shotcrete) installed to stabilize the soil. In this instance, the soil nail wall will be installed behind the abutment face to remove the lateral load on the abutment and allow for the installation of micropiles to support the bridge rather than full piles. Recently, the City has seen this application at the new Lofts development, 6th Street Station Development, and the teacher housing at Cardiff Mesa.
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We are currently awaiting a final baseline schedule from the contractor. Because much of the timeline depends on weather and delivery times, the schedule will likely fluctuate throughout the project, but we will advertise and publish any significant closures or delays ahead of time so that the public can plan for them. Generically, the timeline looks like this:
Winter-Spring 2019: Begin soil nail walls for abutment
Summer 2019: Pedestrian bridge set
Late Summer 2019: Traffic Bridge closure and installation of new bridge
Late Summer - Fall 2019: Pier removal from Roaring Fork
Fall 2019: Aesthetic applications, landscaping
Winter 2019: Substantial completion
As with any construction there will be delays. People want to see what is going on in the area, it is a neat project and people may slow to look at the project. In order to reduce these delays, the City is asking that drivers stay off their phones, pay attention to the signage, and follow the direction of our personnel who are on site directing traffic.
At this time, the City anticipates these closures and delays:
The City intends to limit river closures with adequate notification. Most full closures will take place overnight, excluding the full closure for the bridge replacement. Temporary holds may be necessary during critical overhead work and during the in-water dates (August 15 – October 15) when the piers are being removed from the river. Please reach out to City staff with any concerns. The City intends to keep full contact with the River Users during this project and hope to minimize our impacts.
The City has received a large amount of grant funding for the 27th Street Bridge that must be used in a specific time frame so that money is not lost. Also, the 27th Street Bridge is rated as the worst rated bridge in Colorado. Even though this is not currently a safety concern, this bridge is a critical connection and it is in a condition that does not allow the City to wait until South Bridge is completed.
One reason that the South Bridge project isn’t underway yet is because of the project’s cost. Prior to a recent agreement with RFTA regarding the intersection at Highway 82 – the cost was in the $60 million -$65 million range. With the agreement in place, the project’s cost has been reduced to the $35 million -$40 million range. The City has bonding capacity remaining from the voter approved bonding measure for A&I sales tax and is applying for grants to help fund the remaining amount of the project. The City is working to finalize the Environmental Assessment for the South Bridge Project and will begin the right-of-way acquisition process once the assessment is complete.
2016 counts included in the 2017 Traffic Analysis show the average daily traffic amounted to 13,360 vehicles. In recent counts, the City estimates that more than 14,000 vehicles a day use the 27th Street Bridge. To give further perspective, Highway 82 near Wal-Mart facilitates 23,000 to 28,000 vehicles per day.
Let’s break this down for full project transparency:
Contract with Wood: $1,202,854
FHWA Off-System Bridge Grant: $620,828
Total Cost to the City: $582,026
For the completion of the bridge design.
Right of Way Acquisition (Completed):
Total Spent: $57,100.66
For the acquisition of Right of Way, permanent easements for utilities, and temporary easements during construction.
Design Services during Construction (Under Contract):
Contract with Wood: $162,420
For answering Requests for Information (RFI) and design support during construction.
Construction Management (Under Contract):
Contract with HDR: $1,249,996.10
Department of Local Affairs Grant: $475,000.00
Total Cost to the City: $774,996.10
For project inspection, management of CDOT paperwork, and contractor management.
Construction Contract (Under Contract):
Contract with Ralph L. Wadsworth: $9,835,123.35
FHWA Off-System Bridge Grant: $1,616,132.00
Federal Mineral Lease District Grant: $500,000.00
Department of Local Affairs Grant: $475,000.00
Total Cost to the City: $7,243,991.35
A support designed to sustain vertical load. In this instance, the existing bridge has two piers in the Roaring Fork River, near the bank in order to help support the bridge girders and deck. The new bridge will be a single span from abutment to abutment, removing any obstruction in the water.
A structure built to support the lateral load of a span (bridge) at the ends of the bridge. With the limited space we have to construct, the abutments for the new, single span bridge, are being constructed in place in front of the existing bridge abutments with a combination of soil nails and micropiles. This allows the existing bridge to remain functional through most of the construction.
A micropile is a small diameter drilled and grouted pile used to reinforce a foundation. In many instances micropiles are used in this area to gain friction for the stabilization of a foundation when bedrock cannot be reached. The project will use micropiles for the new bridge because a pile machine is quite large. If there were used, they City would not be able to construct the new bridge in place while keeping the existing bridge open. This also makes the construction footprint much smaller with less impacts. Recently the City used these on the Midland Avenue Pedestrian Bridge and the 14th Street Pedestrian Bridge.