RGA's Structural Engineering Experience
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72nd Avenue Bridge Over Burlington Ditch/96th Avenue Bridge over O'Brian Canal
Client: Adams County, Colorado
Description: RGA was retained by Adams County to prepare construction plans, specifications, and estimates for the replacement of two single-span bridges over privately-owned irrigation canals. The project included roadway approach design and, for the 72nd Avenue bridge, the design of new roadways to accommodate a relocation of the bridge. Construction phasing of the bridge replacements was complicated by the year-round flow in the irrigation ditches.
Description: RGA was retained by Adams County to prepare construction plans, specifications, and estimates for the replacement of two single-span bridges over privately-owned irrigation canals. The project included roadway approach design and, for the 72nd Avenue bridge, the design of new roadways to accommodate a relocation of the bridge. Construction phasing of the bridge replacements was complicated by the year-round flow in the irrigation ditches.
Adams County Bridge 303
Client: Adams County, Colorado
Description: RGA designed an 80' single-span bridge, a quarter mile of roadway, and channel improvements along with a park. The roadway stayed open at all times.
Description: RGA designed an 80' single-span bridge, a quarter mile of roadway, and channel improvements along with a park. The roadway stayed open at all times.
Alamosa Pedestrian Bridge
Client: City of Alamosa, Colorado
Description: This project required the design of a 300' three-span bridge over the Rio Grande River. Superstructure utilized precast box girders. Substructure was founded on steel piling. RGA coordinated with the U.S. Army Corps for the 404 Permit and with their levee project in Alamosa. RGA provided construction observation and administration.
Description: This project required the design of a 300' three-span bridge over the Rio Grande River. Superstructure utilized precast box girders. Substructure was founded on steel piling. RGA coordinated with the U.S. Army Corps for the 404 Permit and with their levee project in Alamosa. RGA provided construction observation and administration.
Cameo Bridge over the Colorado River
Location: Mesa County, Colorado
Description: The original bridge was comprised of five spans using steel trusses for a total length of 416 feet. This single-lane bridge provides access to the Public Service, Cameo Power Plant, access for coal shipments to the power plant, and access to public lands. The final design utilized three spans of precast concrete girders supported by piers and abutments, founded on steel piling. Reducing the number of piers and scheduling fall construction reduced construction costs and minimized the impact to the endangered fish in the Colorado River.
Description: The original bridge was comprised of five spans using steel trusses for a total length of 416 feet. This single-lane bridge provides access to the Public Service, Cameo Power Plant, access for coal shipments to the power plant, and access to public lands. The final design utilized three spans of precast concrete girders supported by piers and abutments, founded on steel piling. Reducing the number of piers and scheduling fall construction reduced construction costs and minimized the impact to the endangered fish in the Colorado River.
Chase Street Bridge over North Clear Creek
Client: City of Black Hawk, Colorado
Description: RGA was retained by the City of Black Hawk for the design of a replacement bridge over North Clear Creek. In addition to very tight site constraints, the project included a CDOT access permit, Department of Health dewatering permit, and a full U.S. Army Corps of Engineers 404 permit.
Description: RGA was retained by the City of Black Hawk for the design of a replacement bridge over North Clear Creek. In addition to very tight site constraints, the project included a CDOT access permit, Department of Health dewatering permit, and a full U.S. Army Corps of Engineers 404 permit.
Colorado River Pedestrian Bridge
Client: City of Grand Junction, Colorado
Description: RGA designed a 410', three-span pedestrian bridge across the Colorado River. This bridge utilized CDOT G-GB girders supported by concrete foundations at larger diameter caissons. Extensive work was done to mitigate environmental problems.
Description: RGA designed a 410', three-span pedestrian bridge across the Colorado River. This bridge utilized CDOT G-GB girders supported by concrete foundations at larger diameter caissons. Extensive work was done to mitigate environmental problems.
Costilla Avenue Pedestrian Bridge
Client: Town of Littleton, Colorado
Description: RGA provided the design and construction observation for the installation of a 50-foot-span pedestrian/bicycle bridge across the Highline Canal. The project included concrete trail approaches and drainage modifications to Costilla Avenue.
Description: RGA provided the design and construction observation for the installation of a 50-foot-span pedestrian/bicycle bridge across the Highline Canal. The project included concrete trail approaches and drainage modifications to Costilla Avenue.
County Road 6 Bridge over Buchanan Creek
Client: Grand County, Colorado
Description: RGA was retained by Grand County for the final design of a 122' single-span bridge over Buchanan Creek at the Granby Reservoir. The project included roadway approaches, hydrology/hydraulics, bridge design (utilizing horizontally curved weathering steel plate girders), detour design, and application for permits.
Description: RGA was retained by Grand County for the final design of a 122' single-span bridge over Buchanan Creek at the Granby Reservoir. The project included roadway approaches, hydrology/hydraulics, bridge design (utilizing horizontally curved weathering steel plate girders), detour design, and application for permits.
County Road 10 over Blue River
Client: Grand County, Colorado
Description: RGA was retained by Grand County for the final design of a 106' single-span, prestressed concrete girder bridge over the Blue River. The project included roadway approaches, hydrology/hydraulics, bridge design, detour design, and application for permits.
Description: RGA was retained by Grand County for the final design of a 106' single-span, prestressed concrete girder bridge over the Blue River. The project included roadway approaches, hydrology/hydraulics, bridge design, detour design, and application for permits.
Jordan Road Bridge over Happy Canyon Creek
Client: Arapahoe County, Colorado
Description: RGA was retained by Arapahoe County for the final design and construction administration of a 130' single-span twin bridge structure to carry Jordan Road over Happy Canyon Creek. Ultimately carrying a four lane divided road, the project utilized phased construction. The project included roadway approaches, on-site detour, hydraulics, utility coordination, and coordination of all approvals and permits.
Description: RGA was retained by Arapahoe County for the final design and construction administration of a 130' single-span twin bridge structure to carry Jordan Road over Happy Canyon Creek. Ultimately carrying a four lane divided road, the project utilized phased construction. The project included roadway approaches, on-site detour, hydraulics, utility coordination, and coordination of all approvals and permits.
Jordan Road Bridge over Newlin Gulch
Client: Douglas County, Colorado
Description: RGA was retained for the reconstruction and widening of Jordan Road, including a new 100-foot two-span precast girder bridge over Newlin Gulch. The new bridge was designed to accommodate channel improvements to Newlin Gulch.
Description: RGA was retained for the reconstruction and widening of Jordan Road, including a new 100-foot two-span precast girder bridge over Newlin Gulch. The new bridge was designed to accommodate channel improvements to Newlin Gulch.
Lemon Gulch Bridge
Client: Parker Water and Sanitation District
Location: Douglas County, Colorado
Description: The bridge spanning Lemon Gulch provides private access to a large pump station and water diversion structure. The 220-foot two-span bridge uses BT54 precast concrete girders with steel piping supporting the center pier and abutments. Due to limited traffic, the roadway width on the bridge was reduced to 20 feet. This bridge also carries a 6-inch gas line, an 8-inch water line, and a 27-inch sanitary sewer line. The RGA team designed the bridge to CDOT and ASSHTO design standards and completed the hydraulic analysis, design, and construction management for this project.
Location: Douglas County, Colorado
Description: The bridge spanning Lemon Gulch provides private access to a large pump station and water diversion structure. The 220-foot two-span bridge uses BT54 precast concrete girders with steel piping supporting the center pier and abutments. Due to limited traffic, the roadway width on the bridge was reduced to 20 feet. This bridge also carries a 6-inch gas line, an 8-inch water line, and a 27-inch sanitary sewer line. The RGA team designed the bridge to CDOT and ASSHTO design standards and completed the hydraulic analysis, design, and construction management for this project.
Main Street Bridge over North Clear Creek
Client: City of Black Hawk, Colorado
Description: RGA prepared the design and performed the construction administration of a prestressed concrete bridge across North Clear Creek. The design included major retaining wall structures to accommodate widening of State Highway 119.
Description: RGA prepared the design and performed the construction administration of a prestressed concrete bridge across North Clear Creek. The design included major retaining wall structures to accommodate widening of State Highway 119.
U.S. 34 over Sheep Draw Bridge
Location: Greeley, Colorado
Description: The RGA team performed all structural design for a 34.4-meter-long single-span bridge on S.H. 34 over Sheep Draw for the Colorado Department of Transportation, Region 4. The plans for this bridge were prepared in metric units.
Description: The RGA team performed all structural design for a 34.4-meter-long single-span bridge on S.H. 34 over Sheep Draw for the Colorado Department of Transportation, Region 4. The plans for this bridge were prepared in metric units.
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