Nation-wide Bridge Inspections and Inventory

Agnes Wilson Bridge Over the Colorado River, connecting Arizona and California on the Colorado Indian Reservation

 

RPKA has inspected hundred of bridges throughout Alaska and the Contiguous United States. Duties for these jobs include inspecting bridge structures, load rating analysis, and inspection reports for these structures, entering FHWA Structure Inventory and Appraisal codes and related work requirements for the BIA. The field inspections for each bridge consisted of bridge component parts measurement, bridge component defects examination, bridge approach roadway and waterway opening and alignments evaluation, upstream and downstream channel evaluation and condition rating, new and worsened defects photographs and/or sketches.

Bridge inspection projects include:

 

Deer Bay Road Bridge Inspections, Hydaburg, Alaska (2014)

The Hydaburg Cooperative Association (HCA) retained RPKA under a term contract to provide bridge inspection services for eleven tribal bridges along Deer Bay Road. Our services include bridge inspection, bridge, channel, and approach measurement, and safe load capacity determination. The bridges include a variety of types on a remote logging road. RPKA created a spreadsheet to calculate the sufficiency rating in accordance with Federal Highway requirements for each bridge. This ongoing project includes submittal of the Structure Inventory and Appraisal data directly to Federal Highways for each bridge, completing funding applications for funding of replacement or rehabilitation of structurally deficient bridges, and design of replacement structures. After completing the field inspections, RPKA recommended immediate closure or shoring of one structure, due to scour under the foundation support.

 

Klawock Island Access Road Design Bridge Inspection, Klawock, Alaska (2014)

RPKA was retained by the Klawock Cooperative Association to inspect several tribal bridges as part of the Island Access and Big Salt Subdivision Addition road improvement project. Three of the bridges qualified for addition to the National Bridge Inventory. The National Bridge Inventory System data summarizing inspection results was submitted directly to Federal Highways and one structure has already been funded by the Indian Reservation Roads Bridge Program for construction. RPKA designed the replacement structure that provides the only road access to Klawock Island and will be involved in the final construction project.

 

E-N Loop Ramp Bridge, Fairbanks, Alaska (2013)

RPKA contracted to Bridge Diagnostics, Inc., of Boulder, Colorado, to provide an Alaska registered engineer to oversee load testing of an Alaska Department of Transportation and Public Facilities bridge. Work involved oversight of three days of field work, which was accomplished at temperatures of -20ºF and also included review of the analysis and stamping the final report. The bridge was a precast concrete structure experiencing unexpected cracking near the girder ends. Our team determined the cracks were caused by bridge configuration and detailing near the beam ends, rather than by overloads. As are result of this work, the bridge was able to safely remain open, maintaining unrestricted use of this primary route, resulting in significant cost savings to the client.

 

Milo Academy Bridge Rehabilitation and Testing (2013)

Milo Adventist Academy retained RPKA for an in-depth inspection of a private fracture-critical bridge, after a bridge inspection by others raised serious concerns with this unique covered bridge. The Academy was looking for options to repair or rehabilitate the bridge to a level adequate for light-to-moderate traffic loads. RPKA conducted an initial site visit to inspect the bridge, using rope-access techniques to reach the bottom of the bridge. Recommendations were made to strengthen and repair weak portions of the bridge. RPKA retained an experienced bridge load-testing firm, Bridge Diagnostics, Inc., that performed instrumentation, load testing, and data collection services during a second site visit in February 2013. It was determined that the bridge is capable of safely carrying heavier loads than anticipated, eliminating the need for immediate construction of a replacement structure.

16 Fracture Critical Bridges Inspections (2012)

BIA needed inspections of 16 fracture critical bridges in 2012, and retained RPKA to perform the fracture critical inspections for bridges located in Oregon, Arizona, New Mexico, Utah, Wyoming, Montana, Nebraska, and North Carolina. Bridges scattered this far apart resulted in travel through 14 states and meetings with seven different BIA regions. The work incorporated access using both ladders and rope access techniques in order to perform a close physical inspection of critical members, as required by fracture critical inspection guidelines. BIA regional personnel observing the field inspections noted that the detailed level of inspection provided by BIA had not been seen on previous inspections by others. All field work was completed on schedule, in spite of the logistical challenges involved. Load capacities were calculated and maintenance recommendations provided in the final reports.

 

18 Underwater Bridge Inspections (2012)

BIA retained RPKA to provide routine and underwater inspections of 18 bridges throughout the United States. As one of the team members on RPKA’s term contract, Ayres Associates was retained for the underwater portions of the inspection. Ayres Associates completed the nine eastern-most bridges and retained Collins Engineers for completion of the nine western-most bridges. The RPKA Project Manager/Inspector was present for all inspections, working as part of the team with both Ayres and Collins to complete the field work. Reports were provided in the BIA’s Bridge Management System with supplemental sketches, narratives, and photos as required for the underwater deficiencies.

 

114 BIA Bridges in the Pacific and Northwest Regions (2012)

RPKA’s services consisted of inspecting a total of 114 bridge structures in the Pacific and Northwest Regions. RPKA performed load rating analysis, and inspection reports for these structures, entering FHWA Structure Inventory and Appraisal codes and related work requirements for the BIA. The field inspections for each bridge consisted of measuring bridge component parts, noting and examining bridge component defects, evaluating bridge approach roadway and waterway opening and alignments, evaluating and rating upstream and downstream channel, and providing photographs and/or sketches of new and worsened defects.

 

Pima-Maricopa Irrigation Project Bridge Inspections (2012)

RPKA provided initial inspections for four bridges for the Gila River Indian Community’s Pima-Maricopa Irrigation Project, southeast of Phoenix, Arizona. The inspections were completed to BIA standards for the tribal government on an accelerated schedule. The completed inspections allowed the bridges to be turned over to the tribal transportation department for future incorporation into the BIA’s bridge inventory. Significant cost savings were achieved for the client by scheduling the field work to coincide with our inspection crew’s travel to a nearby area on another project.

 

261 Bridge Inspections in the Northwest, Western, and Alaska Regions (2010)

RPKA’s services consisted of inspecting a total of 261 bridge structures which consisted of 209 Western Region bridges, 42 Northwest Region bridges, and ten Alaska Region bridges. RPKA utilized three different inspection teams to complete this work, including a team consisting of one inspector from Ayres Associates and one from RPKA that completed a fracture-critical inspection requiring rope-access techniques for the Black River Bridge on the Fort Apache Reservation in Arizona. Work was completed in 2010 and included meeting the typical BIA scope-of-work of providing field inspection, load capacity verification and analysis, maintenance recommendations, cost estimating, and completion of the final reports in BIA’s Bridge Management System. Bridges ranged in location from within 10 miles of the Mexican border to near the Arctic Circle and required access by ropes, boat, and airplane. At least seven fracture-critical bridges were inspected as part of this project.

 

 243 Bridge Inspections in the Northwest, Navajo and Alaska Regions (2007)

RPKA’s services consisted of inspecting a total of 243 bridge structures of which 174 are Navajo bridges, 58 are Northwest Region bridges, and 11 are Alaska Region bridges, load rating analysis, and inspection reports for these structures, entering FHWA Structure Inventory and Appraisal codes and related work requirements for the BIA. The field inspections for each bridge consisted of bridge component parts measurement, bridge component defects examination, bridge approach roadway and waterway opening and alignments evaluation, upstream and downstream channel evaluation and condition rating, new and worsened defects photographs and/or sketches.

 

Bridge 3