Ohio River Harbor Dredge Survey	Harlan County Lake Survey	Red River of the North	Standing Bear Bridge	Vermillion-Newcastle Bridge	Weatherby Lake	U.S. Army Corps of Engineers

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Standing Bear Bridge Hydrographic Survey Project

near Springfield, South Dakota

Eisenbraun and Associates was commissioned as a subconsultant to perform the hydrographic survey at a proposed bridge location. The proposed bridge would span the Missouri River. Schemmer Associates was selected as the design engineer for Missouri River Bridge Project Number HDP-9244(1), C.N. 31213. The data collected by the E/A survey crew would be vital to the design of the future bridge. The data collected by the E/A survey crew were used for hydraulic computations for the design of the bridge. Eisenbraun and Associates utilized its custom-built 26-foot hydrographic survey vessel with GPS positioning capabilities to complete the survey on this sediment choked reach of the Missouri River. An Odom Echotrac Mark II dual frequency fathometer was used for sounding operations. Eisenbraun and Associates completed full hydrographic cross-sections of the Missouri River near Niobrara, Nebraska. All work was done in metric units and all subsequent drawings and plans were also completed using the metric system. Cross-section data were to be collected on predetermined ranges with a fix interval of 10 meters. Ranges that were surveyed extended from one bank to the other of the Missouri River. Final delivery was an ASCII file of x,y,z coordinates (State Plane Coordinates - NAD 83 and NAVD 88). Sounding charts were also provided. The hydrographic survey provided the design team with the data they needed to complete the design on time for this high profile Missouri River bridge.