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11 1 1 1 <br /> ~ ~ 11 1 ~ I ~ 1 <br /> would take the bulk of available funding deteriorated to the level necessary to <br /> for two years. be considered structurally deficient. <br /> In addition to deterioration users Bridges rated structurally deficient due <br /> see, bridge owners are interested to deck deterioration clearly must be <br /> in other signs of deck deterioration. addressed, but there are other, better, <br /> <br /> Approach panels that have settled can indicators of deck conditions that let <br /> cause vehicles to bounce excessively, us know that deck work is needed. <br /> creating increased load effects. Cracks If a deck condition problem can be <br /> allow water to penetrate the deck addressed early enough, the deck may <br /> and can contribute to corrosion of the be treated with an overlay, instead of <br /> reinforcement. While no decks will last requiring a full deck replacement. This <br /> indefinitely, every effort should be made reduces costs and creates safer driving <br /> to prolong the useful life of the bridge conditions. <br /> decks. Recent projects to replace decks, <br /> such as the St. Johns in Portland and Here are the other indicators of deck <br /> the Longview and Biggs Rapids bridges condition the Bridge Section uses <br /> over the Columbia River have been to identify problems as they are <br /> expensive and required closures from developing. In addition to the 38 <br /> several hours to several months. Awell- structurally deficient bridges due to <br /> constructed and maintained bridge deck deck condition, there are: <br /> can be expected to last 30 to 50 years. 1. 167 bridges that have traffic impact <br /> With a life expectancy of this length, loading in the most serious category <br /> modern bridges can expect a deck (rating of 3 on a scale from 1 to 3). <br /> replacement or major rehabilitation 2. 75 brill es with deck crackin that is <br /> mid-way through the bridge's expected g g <br /> life c cle. moderate to severe (ratings of 3 or 4 <br /> y on a scale from 1 to 4). <br /> While joints are a separate element, 3. 30 bridges with the wearing surface <br /> they are usually addressed as part in poor condition (rating of 3 on a <br /> of a deck rehabilitation project and scale from 1 to 3). <br /> are often also addressed by district 4. 24 brill es with crackin on the <br /> routine maintenance and major g g <br /> brill a maintenance. Leakin ~oints underside of the deck that shows <br /> g g ~ active corrosion (ratings of 4 or 5 on <br /> can contribute to excessively rapid a scale from 1 to 5 . <br /> deterioration of concrete and corrosion ) <br /> of steel bearings. 5. 60 bridges with the deck element <br /> that has already required significant <br /> In 2008, ODOT has 179 bridges that patching (concrete), has advanced <br /> are "structurally deficient." Of these, 38 corrosion (steel), or shows loss of <br /> bridges are structurally deficient due strength due to decay (timber); <br /> to just the condition of the deck. While (ratings of 3, 4 or 5 on scales from 1 <br /> some of these bridges are scheduled to 4 or 1 to 5). <br /> for repair or replacement through <br /> either the STIP or OTIA III program, Since some bridges have multiple areas <br /> an average of 12 bridges are rated of concerns, there are 309 bridges <br /> as structurally deficient each year. In that currently meet one or more of the <br /> addition, there are bridges with deck criteria noted above. <br /> issues that are of concern that have not <br /> 39 <br /> <br />