Mohave Valley Conservation Area, 2019 Annual Report
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Mohave Valley Conservation Area 2019 Annual Report May 2021 Work conducted under LCR MSCP Work Task E35 Lower Colorado River Multi-Species Conservation Program Steering Committee Members Federal Participant Group California Participant Group Bureau of Reclamation California Department of Fish and Wildlife U.S. Fish and Wildlife Service City of Needles National Park Service Coachella Valley Water District Bureau of Land Management Colorado River Board of California Bureau of Indian Affairs Bard Water District Western Area Power Administration Imperial Irrigation District Los Angeles Department of Water and Power Palo Verde Irrigation District Arizona Participant Group San Diego County Water Authority Southern California Edison Company Arizona Department of Water Resources Southern California Public Power Authority Arizona Electric Power Cooperative, Inc. The Metropolitan Water District of Southern Arizona Game and Fish Department California Arizona Power Authority Central Arizona Water Conservation District Cibola Valley Irrigation and Drainage District Nevada Participant Group City of Bullhead City City of Lake Havasu City Colorado River Commission of Nevada City of Mesa Nevada Department of Wildlife City of Somerton Southern Nevada Water Authority City of Yuma Colorado River Commission Power Users Electrical District No. 3, Pinal County, Arizona Basic Water Company Golden Shores Water Conservation District Mohave County Water Authority Mohave Valley Irrigation and Drainage District Native American Participant Group Mohave Water Conservation District North Gila Valley Irrigation and Drainage District Hualapai Tribe Town of Fredonia Colorado River Indian Tribes Town of Thatcher Chemehuevi Indian Tribe Town of Wickenburg Salt River Project Agricultural Improvement and Power District Unit “B” Irrigation and Drainage District Conservation Participant Group Wellton-Mohawk Irrigation and Drainage District Yuma County Water Users’ Association Ducks Unlimited Yuma Irrigation District Lower Colorado River RC&D Area, Inc. Yuma Mesa Irrigation and Drainage District The Nature Conservancy Other Interested Parties Participant Group QuadState Local Governments Authority Desert Wildlife Unlimited Lower Colorado River Multi-Species Conservation Program Mohave Valley Conservation Area 2019 Annual Report Prepared by: Laken Anderson, Restoration Group Laura Beth Sabin, Wildlife Group Jeff Lantow, Fisheries Group Becky Blasius and Jimmy Knowles, Adaptive Management Group Lower Colorado River Multi-Species Conservation Program Bureau of Reclamation Lower Colorado Basin Boulder City, Nevada http://www.lcrmscp.gov May 2021 Anderson, L., L.B. Sabin, J. Lantow, B. Blasius, and J. Knowles. 2021. Mohave Valley Conservation Area, 2019 Annual Report. Lower Colorado River Multi-Species Conservation Program, Bureau of Reclamation, Boulder City, Nevada. ACRONYMS AND ABBREVIATIONS CSLC California State Lands Commission FY fiscal year LCR MSCP Lower Colorado River Multi-Species Conservation Program MVCA Mohave Valley Conservation Area PIT passive integrated transponder Reclamation Bureau of Reclamation Symbols < less than CONTENTS Page 1.0 Introduction ................................................................................................... 1 1.1 Background ......................................................................................... 1 1.2 Previous Activities .............................................................................. 1 2.0 Conservation Area Information .................................................................... 2 2.1 Purpose ................................................................................................ 2 2.2 Location .............................................................................................. 2 2.3 Landownership .................................................................................... 4 2.4 Water ................................................................................................... 4 2.5 Agreements ......................................................................................... 4 2.6 Public Use ........................................................................................... 5 2.7 Law Enforcement ................................................................................ 5 2.8 Wildfire Management ......................................................................... 5 3.0 Habitat Development and Management........................................................ 6 3.1 Planting ............................................................................................... 6 3.2 Irrigation ............................................................................................. 6 3.3 Site Management ................................................................................ 6 4.0 Monitoring .................................................................................................... 8 4.1 Backwater Monitoring ........................................................................ 8 4.1.1 Native Fishes ........................................................................... 8 4.1.2 Water Quality .......................................................................... 9 4.2 Avian Monitoring................................................................................ 9 4.3 Small Mammal Monitoring................................................................. 9 4.4 MacNeill’s Sootywing Skipper Monitoring........................................ 9 5.0 Habitat Creation Conservation Measure Accomplishment........................... 9 5.1 Vegetation Monitoring ........................................................................ 9 5.2 Evaluation of Conservation Area Habitat ......................................... 10 6.0 Adaptive Management Recommendations ................................................. 10 Literature Cited ..................................................................................................... 11 Tables Table Page 1 MVCA backwater scanning summary ........................................................ 8 i Figures Figure Page 1 Location of the MVCA within Reach 3. ..................................................... 3 2 Managed acreage of the MVCA for FY19. ................................................ 7 ii 1.0 INTRODUCTION The purpose of this annual report is to summarize all activities that have occurred at the Mohave Valley Conservation Area (MVCA) from October 1, 2018, through September 30, 2019, which is Federal fiscal year (FY) 2019, and projected activities for FY20. Use of Colorado River water is presented for the calendar year, January 1 through December 31, 2019, consistent with the Colorado River Accounting and Water Use Report: Arizona, California, and Nevada, Calendar Year 2019 (Bureau of Reclamation [Reclamation] 2020). 1.1 Background The MVCA is a connected backwater created to divert water off the main stem of the Colorado River just below River Mile 237. Diverted flows run through an excavated channel, enter the existing Park Moabi backwater, and converge with the river 2 miles downstream from the new point of diversion. Excavating the channel created 561 acres of backwater habitat. The footprint of this conservation area is approximately 92 acres, with native land cover types lining the banks and upland slopes of the backwater accounting for the additional 31 acres. The MVCA is located 13 miles south of Needles, California, along the Colorado River. The 149-acre property resides within the boundary of Park Moabi Regional Park. The land is owned by the California State Lands Commission (CSLC) and leased to San Bernardino County. Prior to approaching the CSLC and county about the backwater project, the 149-acre parcel was used as an off- highway vehicle recreational area; however, once the backwater project was presented, the county was willing to divide the property to accommodate both uses. The project’s area of impact involved the entire 149 acres (includes areas of fill), as well as lands at the top and bottom of the parcel, to connect the backwater to the main stem of the Colorado River and the Park Moabi channel. Excavated material was used throughout the site to create the desired contour elevations, but the majority of the excavated material was used to create terrain within the county’s off-highway vehicle area. 1.2 Previous Activities The CSLC (the landowner) and San Bernardino County (the lessee) were approached about the project in 2012. Basic, conceptual ideas about the project 1 Mohave Valley Conservation Area 2019 Annual Report were presented to the CSLC and the county, and discussions and lease agreement negotiations continued, but they could not move toward a final agreement without an official design proposal for the project. Reclamation worked with the CSLC to ensure National Environmental Policy Act/California Environmental Quality Act permitting requirements are met. Both the U.S. Army Corps of Engineers and the U.S. Fish and Wildlife Service were notified about the project. A survey of the 149-acre parcel was conducted to establish new control points and to develop elevation contours. Additionally, a temporary gauging station was installed directly across the river from the proposed inlet location so the river stage could be monitored. The data, in conjunction with the site elevation data, were used to determine the volume of material that would be excavated to achieve the desired depth of the backwater. The permits necessary