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Nominee: Innovative Management – Small Project The risks of abandoned iron ore mine shafts may not seem like a concern for highway engineers, but the Minnesota Department of Transportation knows differently. The Minnesota DOT knew that some of those shafts extended below the freeway, and that a collapse in those aging shafts could damage the road and endanger motorists. The US 169 Chisholm Mining Mitigation project mapped abandoned iron ore mine shafts that ran under the highway, which led to the construction of a “super-strong” section of highway 2-miles-long that could withstand a shaft collapse up to 24-feet wide without endangering the motoring public. |
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America's Transportation Awards 