Project Summary

Location: Brighton, Colorado
Client:  Nebraska Community Foundation
Contract Value: $1,641,000

RMC was contracted to construct seven bend-way weir structures to stabilize and restore the North Platte River channel as it traverses through the Wyoming-Nebraska State Line flume. The objective of the project, located along the North Platte River near Henry, Nebraska, was to restore the river channel to its pre-erosional course. Prior to construction, the river was threating to damage the water-flow-measurement device installed between the Wyoming and Nebraska state line. Straightening the river also improved measurement data by allowing even flow across the weir. The construction activity was completed during the winter months to take advantage of historic and seasonal low-flow conditions. RMC conducted water turbidity testing during all in-stream work in accordance with Nebraska State regulations.

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RMC successfully completed the project using both traditional rip rap and innovative sand tubes to construct the weirs. The tubes were constructed using a Continuous Berm Machine with sand removed from the sandbar at river center (see drawing above) and geotextile fabric. The tubes were constructed in 20-to 40-foot lengths and placed in position in shallower portions of the river (less than three feet of water). Three of the weirs were constructed entirely of tubes. Two of the weirs were constructed entirely of rip rap in the deeper parts of the river (3 to 12 feet). RMC reviewed the weir design and using value engineering, constructed the remaining two weirs of rip rap and sand tubes. This technique both met channel-bank stabilization design requirements and reduced the amount of erosion of the sandbar required to straighten the river. The overall effect was to lessen the sediment load caused by weir construction, while achieving the project goals.

Primary Tasks:
  • Erosion contro
  • Stream-bank restoration
  • Stream turbidity monitoring
  • Bend-way weir construction
  • Re-vegetation
  • River channel restoration