NM FLAP 152(1) NM 152 Bridges

The project includes the replacement of two truss bridges. The bridges were built in 1929 and are single-lane bridges. The existing structures are geometrically obsolete in the sense that they are restricted in width and height. The new bridges are designed with increased width to accommodate two lanes of traffic, increased traffic load, pedestrians, equestrians, and bicyclists. Bridge #1520 is approximately 5 miles west of Hillsboro, NM and crosses Percha Creek. It will be constructed immediately downstream of the existing bridge and the existing bridge will remain in place. NM Bridge #1520 is located on the new alignment and will be constructed on a horizontal curve. The new bridge will have a curved deck supported by straight precast prestressed concrete I girders. The length of the bridge will be 115 feet measured along the center line of roadway and will be founded on spread footings with 15-foot approach slab at both ends. Retaining walls will be constructed on the north side of the bridge to eliminate the encroachment on right of way and to save part of the historical trail. The existing bridge and road will remain open to allow for one-lane, two-way, alternating traffic. This is the current traffic pattern here due to the narrow existing bridge width preventing from two vehicles passing at once. Additional temporary traffic control measures such as shoulder and/or part lane width and shoulder closures might also be implemented during construction. Bridge #1521 is approximately 7 miles west of Hillsboro, NM and crosses Middle Percha Creek, a tributary to Percha Creek. The proposed bridge will be constructed in the same location of the existing bridge and the existing bridge will be removed. The new structure will provide adequate width to accommodate 2 lanes of traffic with 5 foot shoulders. NM Bridge #1521 is located on a tangent, will have a length of 103 feet and 6 inches and will be founded on spread footings with 12-foot approach slab at both ends. With construction of the new NM Bridge #1521 on the existing alignment, the contractor will be required to design, construct, and maintain a paved diversion allowing for one-lane, two-way, alternating traffic via temporary traffic signals on the north side of existing bridge. The diversion will be removed and restored to existing conditions when the new bridge is open to public traffic. Additional temporary traffic control measures such as shoulder and/or part lane width and shoulder closures might also be implemented during construction. Items worth noting: Bridge #1521 - Diversion Construction and Open to One Lane of Traffic Bridge #1520 - Uses Existing Bridge as Diversion for One Lane of Traffic Bridges are Bulb Tee with Cast In Place Concrete Deck There are sensitive environmental resources immediately adjacent to the work area, including historic features, that will need to be protected in place. Work will occur in mountainous terrain and cut slopes steeper than 1V:2H are anticipated. Large boulders may exist within the proposed excavation limits throughout. Traffic control plans will need to consider methods to prevent parking within active work zones. Principal Work Items Approximate quantities for major work items: Removal of bridge structure 15,800 cubic yards of roadway excavation 6,900 liner feet of controlled blast hole 22,600 cubic yards of waste 580 cubic yard Structural Concrete, Class A (AE) 866 liner feet of Precast, prestressed concrete girder (NM BT 63) Construct and maintain diversion (#1521 remove and restore) 91,900 lbs. Reinforced steel epoxy coated 1600-ton Asphalt concrete pavement, Type 1

Division 01 -	General Requirements, Vehicular Access and Parking, Traffic Control, Temporary Barriers and Enclosures.
Division 03 -	Concrete, Concrete Reinforcing, Precast Structural Concrete.
Division 05 -	Metals, Structural Steel Framing, Structural Steel for Bridges, Steel Joist Framing, Steel Joist Girder Framing.
Division 07 -	Thermal and Moisture Protection, Expansion Control.
Division 09 -	Finishes, High-Performance Coatings.
Division 10 -	Specialties, Signage, Traffic Signage.
Division 26 -	Electrical, Exterior Lighting, Lighting Poles and Standards, Roadway Lighting.
Division 31 -	Earthwork, Embankments, Erosion and Sedimentation Controls, Slope Protection, Gabions, Riprap, Special Foundations and Load-Bearing Elements, Driven Piles.
Division 32 -	Exterior Improvements, Bases, Ballasts, and Paving, Flexible Paving, Rigid Paving, Fences and Gates, Retaining Walls.
Division 34 -	Transportation, Bridges.