SPRINGFIELD — Efforts continue to develop a sediment management plan for Lewis and Clark Lake/watershed with a stakeholder meeting and scoping review scheduled to begin at noon Thursday, July 25, at the Ponca Tribal Headquarters in Niobrara, Nebraska.

The Missouri Sedimentation Action Coalition requested technical assistance from the U.S. Army Corps of Engineers (USACE) -Omaha District to develop the plan to address the continual loss of benefits to sedimentation, develop strategies to mitigate current sedimentation impacts throughout the watershed, and minimize future impacts.

If sedimentation continues at its current rate, Lewis and Clark Lake is expected to be half full of sediment by the year 2045, according to the Phase II Sedimentation Assessment for the Upper Missouri River Basin as prepared by the U.S. Department of Agriculture Natural Resources Conservation Service.

In 2011, an estimated 26% of the total storage capacity had been lost, according to the draft Project Management Plan as prepared by the USACE.

Thursday’s meeting coordinated by the USACE will include an interactive presentation and provide opportunity for all sponsor representatives to make recommendations and revisions to the tasks anticipated that will be needed to produce a sediment management plan.

More information about this process is outlined in the draft Project Management Plan (PMP) available at

Stakeholder input is very important every stage along the way, said Sandy Stockholm, MSAC executive director. Starting off in the right direction will help produce a well-rounded approach that has the potential of gaining and keeping support, she said.

For more information on the July 25 meeting or the study process, contact MSAC at 605-661-1594 or email

The scoping process, or Phase One, outlines all planned tasks, budget and schedule for all three phases. Phase One completion is anticipated for September 2019. With Phases Two and Three to begin thereafter as funds and support allow.

As outlined in the draft PMP, Phase Two focuses on leveraging existing sediment management studies along with the application of economic models to consider the costs and benefits associated with sediment management. Phase Three expands the technical analysis to consider emerging technologies, integrate environmental benefits and impacts, and develop a detailed Sediment Management Plan for Lewis and Clark Lake. The study is expected to summarize the delta evolution, related sediment impacts at the project and upstream river reach and provide a review of current and emerging sediment management methods and how they may apply at Lewis and Clark Lake.

This study will not allow for construction by itself, however, if a construction or management project is identified, other avenues can be explored for possible implementation.

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