The new TxDOT bridge will replace the existing truss bridge over the Colorado River in Columbus, Texas. Stiver Engineering provided construction consulting to the bridge contractor with cofferdam designs for crane access on both banks of the Colorado River. The cofferdams allowed the crane to get closer to the center of the proposed bridge so that the bridge beams could be lifted and installed. The cofferdam was constructed using driven sheet piles, wales and cross ties.
To help secure the Baltimore, Maryland City’s water supply, the Baltimore City Department of Public Works is covering a considerable portion of Druid Lake and installing two large underground water tanks. Druid Lake holds filtered and treated water that is ready to be sent to consumers. To protect this drinking water supply, two covered storage tanks, holding more than 50 million gallons of drinking water, will be constructed underground on the western end of the lake. The estimated project cost is $140 million and is expected to be completed in March of 2022. Stiver Engineering provided the excavation plans and shoring plans for the installation of the two underground water storage tanks. The tanks are approximately 400 ft. and 500 ft. diameter and will be installed 40 ft. below natural grade. Stiver Engineering provided construction consulting through a sloped earth design along with a soil nail and shotcrete wall design where sloping was not feasible.