Regulatory and Section 408 Programs

30 Dec 2024

NWO-2021-01961-PIE

Expiration date: 1/20/2025

The U.S. Army Corps of Engineers, Omaha District (Corps), is evaluating a permit application submitted by Westwood Professional Services to expand an existing open pit quarry that would impact wetlands. The applicant is proposing to expand an existing open pit quarry in Minnehaha County, South Dakota for the purpose of mining quartzite. The project would be located on 232.5 acres and consist of the realignment of an existing access road in the site and the realignment of 2,937 linear feet of an unnamed intermittent tributary to Split Rock Creek to facilitate access to the whole of the site for the open pit quarry. Mining is currently underway within the southern portion of the project area. The proposed project would result in impacts to 6,778 linear feet of jurisdictional stream and 10.52 acres of jurisdictional riparian wetlands adjacent to the stream corridor. Based on the available information, the overall project purpose is to provide quartzite aggregate for construction and transportation projects in the Sioux Falls, South Dakota region. The applicant’s project purpose, as stated in the application, is to mine the large quartzite deposits in the area to support future construction and transportation projects in the Sioux Falls, South Dakota region.

30 Dec 2024

NWO-2024-01927-RWY

Expiration date: 1/13/2025

The U.S. Army Corps of Engineers, Omaha District, (Corps) and Wyoming Department of Environmental Quality (WDEQ) are evaluating a permit application and certification request to decommission the LaPrele Dam, which would result in the discharge of fill material into approximately 5.49 acres of waters of the United States, including LaPrele Creek and LaPrele Reservoir. This notice is to inform interested parties of the proposed activity and to solicit comments. Further, the Corps is informing members of the public of alternative procedures for permitting in response to this emergency situation. This joint notice may also be viewed at the Corps web site at: https://www.nwo.usace.army.mil/Missions/Regulatory-Program/Wyoming/Public-Notices/. The applicant is proposing to remove a structurally deficient 135foot-tall concrete dam, no later than April 1, 2025, in response to a breach order from the Wyoming State Engineer’s Office (WSEO). LaPrele dam would be deconstructed using mechanical breaching or blasting. Concrete from the removed portion of the dam would be handled in the following manner: 1) partially remaining within the footprint of the dam; 2) 7,030 cubic yards placed in a rubble chute on the downstream side of the dam in LaPrele Creek to prevent excessive erosion; and 3) 8,830 cubic yards placed in a pair of optional disposal areas, one of which is located in the drained reservoir. The discharge of additional fill material within the creek and reservoir bed is proposed for construction of: • equipment access ramps to the north side of the dam; • a rock fill check structure to capture sediment and debris from demolition; and • a southern access road and crossing to facilitate access to the south side of the dam. Rock borrow material for the southern access road would be obtained from below the ordinary high water mark of the reservoir. The proposed project would result in a total of 5.49 surface acres of fill placed below the ordinary high water mark of waters of the United States, affecting 0.63 acre of LaPrele Creek and 4.86 acres of LaPrele Reservoir. A total of 4.19 surface acres of waters of the U.S. would be affected by cut (dredge) activities through the excavation of 3,486 cubic yards of rock and earthen material to be redistributed for access purposes. Based on the available information, the overall project purpose is to breach LaPrele Dam before potential catastrophic failure during spring 2025 runoff. The applicant’s project purpose, as stated in the application, is to comply with WSEO order that the concrete structure of the LaPrele Dam be removed to a final elevation of 5,400 feet, no later than April 1, 2025

23 Dec 2024

NWO-2021-01923

Expiration date: 1/19/2025

The US Army Corps of Engineers, Omaha District, Montana Regulatory Office, is evaluating a request by Eco-Asset Holdings, LLC for a modification of the Montana West Umbrella Mitigation Bank Instrument to add the Musselshell Bank Site project. The site is located on Big Coulee Creek, in Golden Valley County, near Lavina, Montana. The site contains 6,778 feet of stream and 20 acres of wetlands currently. Credits would be generated by rehabilitating 20 acres and reestablishing 9 acres of wetlands and restoring 3,084 feet of stream. The attached public notice provides information pertaining to location, service area, crediting methods and work plan. This notice is to inform interested parties of the proposal and to solicit comments.

12 Dec 2024

408-NWO-2021-0008

Expiration date: 1/27/2025

The purpose of this public notice is to solicit comments from the public regarding the Nebraska Highway 12 Niobrara East and West Project (Section 408 Reference Number: 408-NWO-2021-0008/Section 404 Reference Number: NWO-2004-10258) and to provide notification that the Final Environmental Impact Statement, or Final EIS, is available for review. A section 408 decision has not been made regarding issuance of permission at this time.