Project cost estimate Summary construction program (PB-1), fiscal years 1964 and 1965 Item Location.-On Sacramento River from Colusa to Chico Landing, and on the lower reaches of its tributaries from mouth of Butte Creek to Red Bluff, Calif. Authorization.-1944 and 1950 Flood Control Acts. Benefit-cost ratio.-1.6 to 1. Levees: PHYSICAL DATA Average height: 12 feet. Length: 107 miles. Diversion structures: Two. Channels: Channel improvement: 72 miles. Bypass revetment: As required for protection of bypass levee slopes against erosion. Status (Jan. 1, 1964) This project is an integral unit of the authorized comprehensive plan for flood control in the Sacramento River Basin. It is a modification and extension of the Sacramento River flood control project and supplements reservoir units of the comprehensive plan by providing flood protection to certain unprotected or partially protected areas along Sacramento River. Such areas include the city of Chico (population 15,400), other smaller communities, about 80,000 acres of agricultural land important to the economy of the region, U.S. Highways Nos. 99E and 99W, and main lines of transcontinental railroads. The bypass levee revetment features of the project will provide protection to flood plain lands adjacent to the bypasses and will decrease requirements for levee repairs under emergency conditions. Rapid and extensive development currently underway within the project areas along Chico and Mud Creeks and Sandy Gulch necessitates early completion of protective works for those areas. December 1955January 1956 floods caused damages estimated at $1,400,000 within the overall project areas. In addition, the completed portion of the project prevented $300,000 damages. Should such floods occur under current conditions of development and prices, demages estimated at $1,900,000 would result, of which $950,000 would be preventable by completion of the protective works. In addition the already completed portion of the project would prevent $410,000 damages. Average annual benefits are estimated at $1,282,000. Fiscal year 1965.-The requested amount of $1,530,000 will be applied to: Initiate bypass levee revetment_. $340,000 Complete levee and channel improvements on Chico and Mud Creeks Total___. 22,000 140, 000 --- 1, 530, 000 With the funds recommended for fiscal year 1965 the project will be completed prior to the 1964-65 flood season except for revetment of bypass levees. Non-Federal costs.-The initial investment required of local interests in construction of the authorized project is estimated at $6,100,000 broken down as follows: Local interests are required to maintain and operate the project upon completion. The annual cost for maintenance, operation, and replacements is estimated at $97,000. Status of local cooperation.-The Chief of Engineers accepted assurances of local cooperation from the State of California on March 22, 1948. Local interests are represented by the Reclamation Board of the State of California. The board has already furnished all rights-of-way required for the construction contract scheduled to be awarded in fiscal year 1965 (bypass levees revetment). Local cooperation expenditures through September 30, 1963, were $4,783,000. Comparison of Federal cost estimates.—The current estimate of $11,900,000 is a decrease of $600,000 from the latest estimate ($12,500,000) submitted to Congress. The decrease is primarily attributable to a favorable bid on the second and final contract for the Chico and Mud Creeks and Sandy Gulch unit. Summary construction program (PB−1), fiscal years 1964 and 1965 Location. This project is located at Palm Springs, Riverside County, Calif. PHYSICAL DATA Detention reservoir: Spillway: Crest length: 80 feet. Crest elevation: 565.5 feet mean sea level. Design capacity (maximum peak): 13,000 cubic feet per second. The project will protect about 530 acres of exceptionally valuable residential and business property in Palm Springs, Calif., permanent population 17.140 (1963 estimate by city of Palm Springs). The seasonal (winter) population averages approximately 40,000 to 50,000 people. The project will permit higher and more complete utilization of presently undeveloped and partly developed land. The 1963 value of the overflow area is about $58 million, and the 1963 population within the overflow area is about 4,000 residents. Under present conditions of development, the project would prevent damages ranging from $600,000 to $750,000 should the 1916 and 1927 floods recur. A very high flood potential exists due to flash floods originating in steep, bare slopes of the San Jacinto Mountains. Average annual benefits (all flood control) are estimated at $128,000. Large benefits not susceptible of monetary evaluation would also accrue from the project, including elimination of possible loss of life. Fiscal year 1965.-The requested amount of $830,000 will compete the project and will be applied to: Complete construction of detention reservoir embankment and outlet works.---. Engineering and design.___. Complete construction of channel.. Supervision and administration__. Total $348,000 436,000 6,000 40.000 830,000 Non-Federal costs.-The investment required of local interests for construction of the authorized project is estimated at $1,110,000, broken down as follows: Lands, damages, and relocations____. Total $500,000 610,000 1,110,000 Local interests are required to maintain and operate the project upon completion. It is estimated that the average annual expenditure for operation and maintenance will total $6,000. Local interests have expended about $100,000 in the project area to facilitate passing floodwater through Palm Springs. In addition thereto, they have spent about $1,342,000 for partial flood protection at neighboring canyons within the Whitewater River Basin. Local interests estimate that flood control expenditures for proposed work in the Whitewater River Basin will approximate $2,500,000. Status of local cooperation.-The Board of Supervisors of Riverside County Flood Control and Water Conservation District passed a resolution June 14, 1957, and March 8, 1963, in which it agreed to assume the required items of local cooperation and indicated its intention to provide the financial contributions specified by Congress. By letter dated October 17, 1963, the Riverside County Flood Control and Water Conservation District stated that the current budget has $430,000 to apply toward paying its share of the cost of the project. A total of $600,000 was appropriated by California State Legislature in 1963 for lands, easements and utility relocations. The city of Palm Springs has voted a $100,000 bond issue to assist in financing this project. Comparison of Federal cost estimates.-The current Federal cost estimate of $1,110,000 is the same as the latest estimate submitted to Congress. Summary construction program (PB−1), fiscal years 1964 and 1965 Location. The project is located on Walnut Creek and on the lower reaches of its principal tributaries, Pacheco, Grayson, San Ramon, and Las Trampas Creeks, in Contra Costa County, Calif. Authorization.-1960 Flood Control Act. Benefit-cost ratio.-1.3 to 1. |