13 Aug 2019 – The initial breach was closed on 25 July 2019. Dredging de-mobilization is tentatively scheduled for 16 August 2019. The contractor is approximately 95% complete with the scope of work.
05 Aug 2019 – Work on the second stage (interim) repairs is anticipated to begin the week of 12 Aug 2019.
31 July 2019 – Initial Breach A is substantially complete and the final inspection was held on 15 July 2019. Initial Breach B was closed on 25 July 2019. The Contractor continues to place additional material to build the sand berm to the design width and height. All work on this contract is expected to be complete in late August 2019. A field office has been setup in order to begin the interim repairs.
22 July 2019 – Initial breach repair #1 is complete and the final inspection was held on 15 July 2019. The contractor for initial breach repair #2 has almost completed the sand berm, but has experienced difficulties with the increased flows realized from decreasing the breach opening. As such, the team pursued placement of roughly 800 tons of rip rap north of the breach to stem the flow down the levee toe and into the breach. The pre-construction meeting for the follow-on repairs occurred on 18 July 2019.
11 July 2019 – Hydraulic placement of sand continues to widen the sand berm pad at the first priority breach location. Dredging operations also continue at the second priority breach location with the initial breach closure anticipated for mid-July. A follow-on contract to raise and widen both initial breach repairs has been awarded. This work is set to begin on the first breach location in the upcoming few weeks.
20 June 2019 – For the breach west of Thurman, IA, the priority breach was initially closed on 20 June 2019. This closure stops inflows through the breach and will allow for follow-on construction activities to further increase the level of flood risk management provided by the repaired levee section.
For the breach West of Hamburg, IA, the rock revetment is approximately 40% complete. Two additional tugs have been contracted to help haul shot rock from the quarry, which should help speed up the revetment schedule. Once, the rock revetment has been repaired the contractor will be able to resume directing dredge material into the initial breach closure footprint.
10 June 2019 – For the breach west of Thurman, IA, the contractor resumed dredging operations on 03 June 2019 following the late high water event. Material placed prior to the recent (29 May 2019) high water event largely remained in place with minimal erosion observed.
For the breach West of Hamburg, IA, a contract modification was executed on 3 June 2019 to procure and place rock in a revetment alignment along the Missouri river to reduce flow velocity through the breach. The first rock placement in the revetment occurred on 3 June 2019. Both 18” dredges are also currently placing material to minimize material loss from the high water levels.