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Bridge watch: Rating Minnesota's bridges
More than 300 Minnesota bridges receive special scrutiny because of structural deficiencies, outdated design features that make them functionally obsolete or use of gusset plate connectors similar to those on the Interstate 35W bridge that collapsed. Not all of these bridges rank low on the federal government's 100-point rating scale, however. Generally, a rating below 80 means the bridge needs some rehabilitation, while those of 50 or less may need to be replaced. The map includes main highway bridges and about 35 local bridges that use gusset plates. The data is from the most recently available National Bridge Inventory database and from Minnesota Department of Transportation reports.
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