DISCOVERY BRIDGE OVER MISSOURI RIVER

[mowafi3m]

DISCOVERY BRIDGE OVER MISSOURI RIVER

SUMMARY
For the Discovery Bridge project, we provided plans for both concrete girder and steel girder designs. A major emphasis was placed on constructability throughout the design effort. The girder sections’ length and depth were adjusted to stay within the capabilities of nearby shops and the HPS70W flange plates were limited to 2 inch thickness because there are three producers that can provide plates up to 2 inch thickness but only one that can supply plates over 2 inches thick. These limits helped determine the best span arrangement, girder size, and girder spacing to use. The concrete girder design team was required to use the same span arrangement as the steel design, but was not limited to the same girder depth. We received three bids on the project – all for the steel option with the low bid being more than $300,000 below the estimate. No bids were received for the concrete girder option. The construction time estimated for this project was three years, but the contractor was able to complete the bridge more than a year ahead of schedule.

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