Modifications have been made to eight of nine targeted truss bridges — similar to the span that fell in 2007 in Minneapolis, Minn. — to ensure they conform to new safety standards put in place after the deadly collapse, the state highway department's chief engineer said Tuesday. Until work starts on the ninth bridge, the State Highway 100 bridge over Dry Creek in Cherokee County, its weight limit will be decreased to less than 15 tons, or the weight of a fully loaded school bus, Gary Evans, chief engineer with the state Transportation Department said. The weight limit is intended to prevent additional damage to the bridge. All 95 truss bridges in the state are safe, Evans said. "If we ever had a bridge that we thought was unsafe, we would close that,” he said. "This was a design review of the original design.” After the Minnesota bridge collapse, state transportation officials launched a special inspection of truss bridges, some of which date to the mid-1920s. The last truss bridge was built in Oklahoma in 1965. Modifications to the eight bridges consisted of either putting additional bracing on the gusset plates, which connect structural parts of the bridge, or replacing rivet connectors to the gusset plates with high-strength bolts, Evans said. After the work was done, weight limits on the bridges were increased, he said. The consultants have reviewed 32 truss bridges so far, Evans said. The state still is awaiting reports on the other 63 bridges. It's hoped the state will have all the reports in the next three to four months. Of the 32 bridges inspected by the Baker firm, three were found to be in compliance with latest safety standards, said Terri Angier, a Transportation Department spokeswoman. Minor modifications are needed on 20 others. The cost of repairs is included in the department's budget.Comments
• State Highway 109 bridge over the Kiamichi River, 16.8 miles east of U.S. 271 in Choctaw County.
• State Highway 3 bridge over the Kiamichi River, 8 miles east of Antlers in Pushmataha County.
• U.S. 70 eastbound bridge over Little River, 5.8 miles north of the U.S. 259 junction in McCurtain County.
• U.S. 271 bridge over Fourche Maline, 26 miles north of the Pushmataha County line in Le Flore County.
• State Highway 74 bridge over the Washita River, 1.4 miles north of State Highway 19 in Garvin County.
• State Highway 75 bridge over Rock Creek, 7.2 miles north of State Highway 3 in Coal County.
• Two parallel bridges on U.S. 169 over Bird Creek, 7 miles north of the Interstate 44 junction in Tulsa County.