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Lower Mission Creek Flood Control
City Cross Street Document Type Description Date Received
Santa Barbara Between Carrillo St. and the Ocean CDFW is intending to execute a Lake and Streambed Alteration Agreement pursuant to Section 1602 of the Fish and Game Code (# 1600-2015-0019-R5), to the Project applicant, Brian D'Amour, City of Santa Barbara Public Works. The Project proposes to replace a 41-foot long by 32-foot wide vehicle bridge with a 55-foot long by 49.5-foot wide span bridge. The new bridge will consist of cast-in-steel shells which support reinforced concrete pile caps, which in turn support the bridge abutments, supporting the bridge deck. The piles require piling driving, the walls will be cast-in-place, the deck will be pre-cast, and the utility lines will be relocated. The bottom of the channel shall remain a natural substrate or replaced with engineered streambed material, which is suitable for fish migration. Water diversion consists of two upstream coffer dams, with two 24-inch PVC pipes allowing water to flow past the Project site and back into the channel. No surface flows shall be diverted using a pump. 5/8/2015
Santa Barbara Between Carrillo St. and the Ocean The project is designed as a restoration project, and to increase the flood capacity to a 20 year event level by redesigning the banks from a concrete trapezoidal shape to vertical concrete walls for the lower half, and sloped ungrouted rock rip-rap upper banks at a 1:5.1 slope, with native plantings for the upper half of the banks. This will increase the capacity to 3,400 cfs. The final configuration will have a width range from 60 to 70 feet at the top, and an average depth of 8 to 12 feet throughout the project site. 6/27/2011
Santa Barbara Between Carrillo St. and the Ocean The project is designed as to replace the structurally deficient Ortega Street Bridge and is part of the ACOE Lower Mission Creek Flood Control Feasibility Study, EIS/EIR. The project includes the demolition of the existing bridge and adjacent residential buildings. The new bridge will be 60 feet wide and 52 feet long and will be composed of single span precast/prestressed concrete slabs supported by cast in place concrete abutments founded on cast in steel shell piles. Concrete semi-gravity cantilever and soldier pile channel walls will be constructed both up and down stream of the bridge to affect smooth hydraulic transition between the bridge and the existing banks. 4/27/2011
Santa Barbara Between Carrillo St. and the Ocean Component 6 is a part of the larger Lower Mission Creek Flood Control Project, and will reconstructed a portion of Lower Mission Creek to improve flood flow conveyance, reduce erosion, and improve water quality. Component 6 involves removing old and various forms of bank revetment, widening the creek channel, increasing channel capacity to ~3,400 cubic ft per second, and providing an ~20 yr level of flood protection. Natural channel banks will be constructed and stabilized, where feasible. A structure near Mason Street may be removed as part of the Project, and a lagoon will be constructed in its place. The Project also includes removing non-native plants, plating riparian vegetation, and constructing goby refuges, fish ledges and fish baffles. 5/21/2009
Santa Barbara Between Carrillo St. and the Ocean A proposal by the U.S. Army Corps of Engineers and the Santa Barbara County Flood Control and Water Conservation District, in cooperation with the City of Santa Barbara, to construct a flood control project on Lower Mission Creek between Canon Perdido Street and Cabrillo Boulevard. The project would increase channel capacity from as little as 1500 cfs (5-year storm) to 3400 cubic feet per second (cfs), providing approximately a 20-year level of protection. The natural bottom would be retained and some existing concrete channel bottom would br removed. Creek banks upstream from U.S. Highway 101 would consist mostly of a combination of short (two to four and one half feet) vertical walls at the bottom and vegetated 15-inch thick riprap side slopes at a 1.5:1 (horizontal: vertical) or flatter slope above. The riprap slopes would be covered with topsoil with unreinforced cocrete pipes in varying sizes up to three feet in diameter strategically placed between the riprap to allow planting of larger native trees and shrubs. The topsoil would also be seeded with native seed mix to promote a healthy understory. The toe wall-riprap sideslope would be the pre-dominant treatment upstream from U.S. Highway 101, except in two short reaches upstream of the Haley-De la Vina and De la Guerra Street bridges. Downstream of U.S. Highway 101, vertical walls would be the predominant treatment, with the tow wall-riprap combination found on the easterly bank just above and below the Mason Street bridge and between State Street and Cabrillo Boulevard. The existing channel ranges in width (at the top of bank) from 25 to 70 feet. The final width would range from 53 to 71 feet. The changes to the creek would include creek widening, bridge replacement, bedslope streamlining, creek bank protection and stabilization, and installation of an overflow culvert to bypass the oxbow between U.S. 101 and the Chapala Street Bridge. 12/10/2001
Santa Barbara BETWEEN CARRILLO ST. AND THE OCEAN The EIS/EIR specifically addresses Alternatives 12, 6, and 8. These alternatives would increase the channel capacity to 3,400 cubic feet per second (cfs), providing a 20-year level of protection. Channel improvements would occur on approximately the last mile of the creek between the Canon Perdido Street Cabrillo Boulvevard Bridges. Alternative 12, the National Economic Development (NED) tentatively recommended plan, includes; natural creek bottom; replacement of five bridges, streamlining bedslope, installing a culvert that bypasses the oxbow; stablizing creek banks by using a combination of short vertical walls and vegetated riprap in most places with vertical walls at bridges and at other constrained locations; and construction of habitat zones and a wetland. Alterative 6 consists of: natural creek bottom; stabilized creek banks with vertical walls and vegetated stepped banks; replacement of seven bridges; streamlining bedslope; construction of habitate zones and a wetland; and the oxbow would widened to contain higher flows. Alterantive 8 consists of: natural creek bottom; stabilization of creek banks with vertical concrete walls; replacement of five bridges; streamlining bedslope; installing a culvert that bypasses the oxbow; and construction of habitate zones and a wetland. Future maintenance is an integral part of the project design for all alternatives identified above, and is included in the project description for the life of the project. Project design incorporates planting of vegetation along upper banks, within vacant remnant land parcels, and construction of a wetland. In addition, Alternative 1, the No Action alternative, is considered in the EIS/EIR. 12/28/1999