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Title: Cache Slough/Yolo Bypass ecosystem monitoring study to determine wetland mitigation success
Authors: Stevens, Michelle L.
Rejmankova, Eliska.
Keywords: Habitat
Western riparian
Ecosystem management
Environmental management
Habitat management
Sacramento River (Calif.)
Publisher: U.S. Army Engineer Waterways Experiment Station
Series/Report no.: Technical Report (Wetlands Research Program (U.S.)) ; no. Technical Report WRP-RE-11
Abstract: This report provides monitoring data on the Cache Slough/Yolo Bypass mitigation area. The area was designed and constructed by the Corps of Engineers to function as a mitigation bank to provide mitigation for impacts to fish and wildlife habitats from the Sacramento River Bank Protection Project. The mitigation area includes approximately 9,000 lin ft (approximately 38 acres) of bypassed levee and a 138-acre interior basin area of primarily open water. The Cache Slough site is located west of the Sacramento River in the northern area of the Sacramento-San Joaquin Delta. This study was designed to monitor mitigation success in relation to project goals and objectives, in comparison to adjacent reference areas. Eight permanent transects with associated permanent vegetation quadrats were established around the perimeter of the open-water component of the mitigation area. Species composition, relative abundance, and frequency were measured. Results indicated that native vegetation along the levees is representative of the delta and includes the following: willows (Salix goodingii, S. lasiolepis), elderberry (Sambucus sp.), black walnut (Juglans hindsii), valley oak (Quercus lobata), interior live oak (Quercus wizliwenii), white alder (Alnus rhombifolia), cottonwood (Populus fremontii), hard-stem bulrush (Scirpus acutus), cattail (Typha spp.) and horse tail (Equisetum spp.). Prevalent non-native species include blackberry (Rubus spp.), artichoke (Cynara scolmus), and sweet fennel (Foeniculum vulgare). Eighty-seven percent of the site is dominated by non-native species. Aerial photographs were obtained and field truthed by walking around the site and delineating woody vegetation on the photograph. Results indicated that cover types on the site are open water (125.67 acres), riparian cover (13.45 acres), emergent wetland vegetation (9.54 acres), upland shrub and herbacious (19.11 acres), two upland islands (6.69 acres), upland road and parking (0.95 acre), riprap (0.48 acre), and cross levee (5.55 acres). Total acreage with cross levee is 181.44. Soil samples were collected and analyzed for calcium, magnesium, sodium, chlorine, sulfate, total nitrogen, percent organic matter, and soil texture. Sediment budget data were also collected to qualify sediment input and output on an average tidal cycle. Piezometers were installed to take measurements of surface and interstitial groundwater in both reference and mitigation sites. One-liter composite water samples were taken throughout the year where piezometers were located and analyzed for nutrients, including ammonium, nitrogen, and total phosphorus.
Description: Technical Report
Gov't Doc #: Technical Report WRP-RE-11
Rights: Approved for public release; distribution is unlimited.
Size: 100 pages
Types of Materials: PDF
Appears in Collections:Technical Report

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