Knowledge Core Collection:https://hdl.handle.net/11681/385012024-03-29T08:09:38Z2024-03-29T08:09:38ZSupplemental Environmental Assessment #2 & Finding of No Significant Impact : Deroin Bend Chute Maintenance, Holt County, Missouri, Missouri River Miles 519 to 517United States. Army. Corps of Engineers. Omaha Districthttps://hdl.handle.net/11681/482672024-03-27T16:04:19Z2015-06-01T00:00:00ZTitle: Supplemental Environmental Assessment #2 & Finding of No Significant Impact : Deroin Bend Chute Maintenance, Holt County, Missouri, Missouri River Miles 519 to 517
Authors: United States. Army. Corps of Engineers. Omaha District
Abstract: The purpose of the Proposed Project is to address adverse conditions in the Deroin Bend chute caused by the 2011 Missouri River flood. During the flood, a portion of the left descending bank of the chute was eroded causing the chute to flank the landward end of a dike (L560.3) that ran through the chute channel near Missouri River mile 519. When the dike was flanked, river material accreted along the right descending chute bank on the downstream side of the dike. It is believed that another large flow event through the chute under its current configuration would cause a shift in the chute’s alignment pushing it further around the landward end of the dike and outside of its design footprint. The Proposed Project is needed to arrest the erosion caused by the 2011 flood and maintain the chute’s designed footprint. Installing six new dike structures in the chute near Missouri River mile 517.5 and modifying the existing chute dike structure near Missouri River mile 519 would help maintain the current alignment of the chute. Additionally, during an inspection of the Deroin Bend Chute on January 27, 2015, it was noted that several existing Bank Stabilization and Navigation Project dikes that were modified for shallow water habitat within the main channel of the Missouri River (L560.6, L560.55, L560.35, L559.55, and L559.5) were in need of general maintenance. Concurrent with the construction of the Proposed Project, these dike structures would be repaired back to their original length and height as part of normal Missouri River Recovery Program operation and maintenance. A total of approximately 920 tons of rock would be used to repair the existing Missouri River dike structures.
Description: Supplemental Environmental Assessment and Finding of No Significant Impact2015-06-01T00:00:00ZDeadmans Run, Lincoln, Nebraska: Section 205 - Flood Risk Management : Final Integrated Feasibility Report and Environmental AssessmentUnited States. Army. Corps of Engineers. Omaha Districthttps://hdl.handle.net/11681/482542024-03-27T16:07:39Z2018-08-01T00:00:00ZTitle: Deadmans Run, Lincoln, Nebraska: Section 205 - Flood Risk Management : Final Integrated Feasibility Report and Environmental Assessment
Authors: United States. Army. Corps of Engineers. Omaha District
Abstract: This flood risk management study is being carried out under the authority of Section 205 of the 1948 Flood Control Act, (P.L. 80-858), as amended. Under Section 205, the Corps is authorized to study and construct projects (structural and/or nonstructural) to reduce the risks of flooding, loss of life, and property damage in partnership with state and local governments. The non-federal sponsor for this study is the Lower Platte South Natural Resources District (LPSNRD) in Lincoln, Nebraska. In April of 2012 the LPSNRD submitted a request for the U.S. Army Corps of Engineers (Corps or USACE) – Omaha District to analyze potential solutions to reduce flood risks within the city of Lincoln. This study is needed to address the significant flood risk within the almost completely urbanized Deadmans Run watershed in Northeast Lincoln, Nebraska. The purpose of this study was to: 1) quantify the flood risks and related flood problems associated with the Deadmans Run watershed within Lincoln, Nebraska, 2) formulate and evaluate alternative plans to address those flood threats, 3) compare those plans against one another based on costs, benefits, and impacts, and 4) select a recommended plan for implementation that would reduce the existing flood risk within the community. Historical urbanization and development has led to an increased flood risk within the city of Lincoln. The primary problems associated with the existing flood risk within the study area are potential life loss, property damage, emergency response costs, and transportation network disruptions associated with high-water flood events. The Expected Annual Damages (EAD) associated with these problems, within the study area, under the existing conditions are just under $2.0M. Flood risk management measures were developed collaboratively with input from the city of Lincoln, LPSNRD, other local and state resource agencies, and the Corps. The solutions investigated included structural measures (levees, channels, etc.), nonstructural measures (floodproofing, relocations, etc.), and a combination of both structural and nonstructural measures. Over a dozen flood risk management measures were identified and screened before being developed into alternatives. A total of four alternatives, including No Action, were evaluated and compared, and based on economic benefits and costs a preferred plan was selected and recommended for implementation. The selected plan for the Section 205 Flood Risk Reduction Feasibility Study, includes a widened channel from Cornhusker Highway upstream to just east of 48th Street (approximately 1.4 miles), replacement of the existing concrete mat and gabions with riprap sized to mitigate streambed erosion and construction of a concrete flume under the BNSF Railroad bridges. This recommended plan consists of increasing the channel capacity to convey the flows associated with the 1% Annual Chance Exceedance (ACE) event, constructing a concrete flume under the existing railroad structures, reconfiguring the access road and underlying culvert to a series of commercial properties along the bank of the channel, and environmental mitigation throughout the project footprint to ensure there is no negative impact on the existing local ecosystem. The recommended flood risk management plan has an estimated total project cost of just over $14.2M. The recommended plan, as developed in this feasibility study and updated in Section 4.4, will reduce flood risks for 487 structures in the Deadmans Run 1% ACE floodplain. This plan would reduce the EAD from $1,946,800 to $520,810 (a 73.0% reduction), resulting in economic benefits of $1,425,990. After accounting for the annualized project costs, the annual net benefits for the recommended plan are $895,610, producing a project benefit to cost ratio (BCR) of 2.69. The estimated cost-shared total for project implementation is $14,235.000. Of the total cost, $1,726,000 is for land, easements, rights-of-way, relocation, and disposal costs (LERRDs), for which credit will be given to the sponsor. Of the total cost, the federal portion is approximately $9,253,000 and the non-federal portion is approximately $4,982,000. Of the total non-federal portion, approximately $3,256,000 will be provided in cash and $1,726,000 will be provided in LERRDs. Estimated average annual cost for operations, maintenance, repair, replacement, and rehabilitation is $25,010.
Description: Integrated Feasibility Report and Environmental Assessment2018-08-01T00:00:00ZFinal Tiered Environmental Assessment & Finding of No Significant Impact (Tiered from the Programmatic Environmental Assessment Signed May 2020) : Public Law 84-99, Emergency Levee Rehabilitation Program & Advanced Measures Civil Emergency Management Program for L-536 Levee Rehabilitation and Large-Scale Levee SetbackUnited States. Army. Corps of Engineers. Omaha Districthttps://hdl.handle.net/11681/482312024-03-27T16:06:53Z2023-02-01T00:00:00ZTitle: Final Tiered Environmental Assessment & Finding of No Significant Impact (Tiered from the Programmatic Environmental Assessment Signed May 2020) : Public Law 84-99, Emergency Levee Rehabilitation Program & Advanced Measures Civil Emergency Management Program for L-536 Levee Rehabilitation and Large-Scale Levee Setback
Authors: United States. Army. Corps of Engineers. Omaha District
Abstract: The purpose of this project is to provide emergency assistance to Atchison County Levee District No. 1, per their written request in the form of levee repair and flood damage reduction as directed by Congress (33 U.S.C. 701n). This program is described in detail in Engineering Regulation 500-1-1. The specific purpose of the Federal action documented in this tiered EA is to rehabilitate the L-536 levee system that was damaged in the 2019 flooding. While significant habitat benefits can result from a large-scale levee setback, habitat restoration is not considered a project purpose when structural repair measures are taken as part of a PL 84-99 levee rehab action. Habitat benefits can more explicitly be part of a project purpose under PL 84-99 if a non-structural alternative plan is selected for implementation, but that was not the case with L-536. All habitat benefits that result from the L-536 project are considered incidental, but were pursed where they aligned with the least cost, most technically feasible structural repair alternative. The pursuit of such “natural and nature-based features” (NNBF) are consistent with statutes governing PL 84-99, including 33 U.S.C Sections 2289a and 2282.
Description: Tiered Environmental Assessment and Finding of No Significant Impact2023-02-01T00:00:00ZEnvironmental Assessment with 404(b)(1) Evaluation & Finding of No Significant Impact : Little Sioux Bend Shallow Water Habitat Restoration, Missouri River Fish and Wildlife Mitigation Project, Harrison County, Iowa, Missouri River Miles 668.3 to 666.7United States. Army. Corps of Engineers. Omaha Districthttps://hdl.handle.net/11681/482302024-03-27T16:07:11Z2014-08-01T00:00:00ZTitle: Environmental Assessment with 404(b)(1) Evaluation & Finding of No Significant Impact : Little Sioux Bend Shallow Water Habitat Restoration, Missouri River Fish and Wildlife Mitigation Project, Harrison County, Iowa, Missouri River Miles 668.3 to 666.7
Authors: United States. Army. Corps of Engineers. Omaha District
Abstract: The Omaha District of the U.S. Army Corps of Engineers (Corps) proposes to create new shallow water habitat (SWH) on the Little Sioux Bend of the Missouri River near the town of Little Sioux, Iowa directly downstream of the Little Sioux River between river miles 668.3 – 666.7 as part of the Missouri River Recovery Program (MRRP). This project would be constructed in response to The U.S. Fish and Wildlife Service (USFWS) amended Biological Opinion (BiOp) for the Operation of the Missouri River Main Stem Reservoir System, Operation and Maintenance of the Missouri River Bank Stabilization and Navigation Project (BSNP), and Operation of the Kansas River Reservoir System. Part of this BiOp included the restoration of 20% of the SWH which existed prior to the construction of the Missouri River Bank Stabilization and Navigation Project (BSNP) to benefit the endangered pallid sturgeon and other native fish species. In general, SWH includes side channels, backwaters, depositional sandbars detached from the bank, and low-lying depositional areas adjacent to shorelines (USFWS, letter dated June 29, 2009). Three potential SWH creation measures were considered. They included: (1) the direct connect chute measure, (2) the 300 feet wide bank lowering measure, and (3) the backwater with connection to Missouri River measure. All SWH development measures were deemed technically feasible; however only measure 1, the direct connect chute measure was carried forward for alternative development. Initially, only two alternatives were considered for the Little Sioux Bend Site. They included Alternative 1 – No Action, and Alternative 2 – Direct Connect Chute with intermediate (ties) channels utilizing the dredge-discharge method of material disposal. Alternative 2 was proposed for implementation because it provided maximum benefits to pallid sturgeon and other native fish species by creating the largest amount of new SWH with the least amount of onsite habitat impacts. While the final draft PIR was out for public review in September of 2013, the Iowa Department of Natural Resources (IDNR) issued the Corps Final Section 401 Water Quality Certification (WQC) that required specific construction methods that had not been evaluated in the original NEPA document. After 30 days the WQC would become binding and so the Corps had no choice but to appeal what the IDNR had issued. Between September 2013 and April 2014 the Corps and IDNR conducted negotiations to determine an agreeable method for disposing of the excavated material. The Corps and IDNR ultimately agreed that a portion of the material would be spoiled onsite and that the rest would be dredged. Updates made to this EA-PIR since September 2013 document evaluation of the negotiated upon alternative included in the IDNR’s final WQC. The proposed project consists of the excavation of approximately 414,000 cubic yards of silty sand to create a 7,300 foot long flow through chute that is connected to the main channel of the Missouri River on the upstream and downstream ends. The chute would be excavated to a bottom width of approximately 70 feet, and the bottom width of the inlet structure would be 150 feet. This would allow the 70 foot wide pilot channel to widen through natural river processes to an ultimate bottom width that is roughly the same as that of the inlet (150 feet). The top 18 inches of the pilot channel would be excavated and spoiled onsite outside of the floodway; the remaining material would be dredged and discharged into the Missouri River. The chute would be dredged to a depth of 2.5 to 5 feet below the water surface elevation at the August 50% duration flow. The project would initially create approximately 24 acres of SWH with the potential of creating up to a total of 33 acres once the chute reaches its desired ultimate bottom width of 150 feet. Other primary project features include intermediate river connections, large woody debris (LWD) structures, and the extension of five existing dikes riverward to maintain adequate navigation depths. The project would be constructed entirely within a 190-acre parcel of Corps-owned land (which is state of Iowa land on the Nebraska side of the Missouri River). The project would cost approximately $3.1 million and would be entirely federally funded. Construction of the proposed project would result in disturbance of alluvial soils and existing terrestrial habitat. Impacts would be minor/long-term and minor/short-term impacts related to construction activities. The minor long-term impacts are outweighed by the overall long-term environmental benefits from creation of new SWH, a type of habitat that is severely lacking in the channelized reaches of the Missouri River. The project benefits would contribute to meeting the requirements of the BiOp and WRDA authorizations.
Description: Environmental Assessment with 404(b)(1) Evaluation and Finding of No Significant Impact2014-08-01T00:00:00Z