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On December 15, 2000, Entranco was authorized by Salt River Project (SRP) to conduct a Class I Inventory of an approximately 9.61-mile-long, variable width corridor from the Thunderstone Receiving Station to the Verde Substation in Maricopa County, Arizona. The project area includes Bureau of Indian Affairs right-of-way across the Salt River Pima-Maricopa Indian Community, and land under the jurisdiction of the Bureau of Reclamation, operated and managed by the Central Arizona Project and SRP. This research is undertaken as part of the proposed SRP Thunderstone to Verde 69 kV Rebuild project. The purpose of the Class I Inventory is to identify all previously recorded cultural resources and cultural resource projects that have occurred within the project area and its immediate vicinity. Cultural resources within these areas could be subject to direct or indirect adverse effects from activities associated with the SRP Thunderstone to Verde 69 kV Rebuild project. For purposes of this study, cultural resources are prehistoric or historic archaeological sites or objects, and potentially significant historic buildings or structures. An evaluation of Traditional Cultural Properties was not included in this inventory. The SRP scope of work includes the installation of a new conductor for the existing 69 kV line, removing and replacing overhead static wires, and the replacement of any poles necessary to accommodate the installation of a new conductor and overhead ground wires. All project work will be conducted within the existing SRP right-of-way, which varies in width from 30 feet (ft.) to 70 ft. The content and level of detail appropriate for this Class I Inventory report was discussed with Mr. Richard Anduze of SRP prior to report preparation. Because the primary objective is to facilitate planning for a 69 kV upgrade of an existing line, it was agreed that the best approach would be to inventory existing data sources and report the locations of previously identified sites and surveys in relation to the project corridor. This method provides the essential information concisely and expeditiously, but does not include a broad overview of the environmental or cultural setting, or any synthesis of the cultural resource data into research-oriented conclusions. Thus, the report is considered only a partial Class I inventory, but it includes all information necessary for the immediate planning-related purposes. Because the project extends across federal land, this report was written to conform to federal guidelines. This is a revised report.

On August 27, 1982, Lyle M. Stone and James E. Ayres of Archaeological Research Services, Inc. (ARS) performed an archaeological survey of an approximately 128 acre parcel of land on the south side of the Salt River near Granite Reef Dam. The study area consists of U. S. Department of the Interior, Bureau of Land Management-administered land which has been withdrawn for U. S. Bureau of Reclamation purposes for use by the Salt River Project. Accordingly, this survey was performed under the authority and conditions of U. S. Department of the Interior Antiquities Permit Number 82-AZ-319 issued to ARS on June 30, 1982. This survey was requested by Salt River Project (SRP) in order to determine if cultural resources were located within the study area which would be affected by the proposed construction and operation of an interconnection between the Central Arizona Project (CAP) canal and the SRP water delivery system. The interconnection will include a turnout structure on the CAP canal and a pipeline or lined canal extending between the CAP canal and the Granite Reef Dam forebay and/or South Canal.

Flooding along the Salt, Gila, Verde, and Agua Fria Rivers in February and March of 1978 resulted in extensive damage to property in Central Arizona and in the disruption of ground transportation and commerce in the greater Phoenix area. Major flooding also occurred along these rivers in December, 1978 and February, 1980. The recognition of this flooding problem, and of requirements for the regulatory storage of Central Arizona Project (CAP) water, prompted the U.S. Department of the Interior, Bureau of Reclamation (Reclamation) to initiate the Central Arizona Water Control Study (CAWCS) in July of 1978. The objectives of the CAWCS were to identify and evaluate alternative measures for flood control and regulatory water storage in Central Arizona. Both structural (i.e., dam construction or modification, levee construction), and nonstructural (i.e., flood proofing, flood plain regulation, water exchange) alternatives were to be considered within a large study area. A Safety of Dams (SOD) issue was subsequently recognized and incorporated in the CAWCS study process. As the study progressed through a consideration of eight alternative plans, a preferred alternative (the agency-proposed action) to address these objectives was selected by Reclamation. Several critical factors were considered in comparing alternative plans, and in defining the preferred plan alternative, including: - flood control performance of a plan - regulatory water storage performance - dam safety - economics (cost/benefits) - environmental impacts - social impacts - institutional constraints Each of these factors was thoroughly evaluated in relation to the plan alternatives during the three stage study process. Stage I established the parameters of the flood control and regulatory water storage problems to be addressed, defined a number of actions (termed elements) which might contribute to the resolution of these problems, and recommended specific actions that warranted further study on the basis of their performance characteristics. Of the 34 elements reviewed during Stage I, 20 were recommended for further consideration at a Stage II level of analysis. During the Stage II analysis, competing elements (those which served similar functions but which were at different locations) were compared in order to define and retain those which best served a particular function. These 10 remaining elements were then combined into 13 intermediate plans, termed systems, each of which could provide for flood control and regulatory water storage. At the beginning of Stage III, 10 elements remained in the study. These were combined into seven candidate plans, each of which satisfied flood control, safety of dams, and regulatory water storage objectives. An eighth plan (No Action) was also defined as a basis for evaluating the effects of a proposed undertaking. As the critical factors were considered in relation to each plan, two of the eight plans (numbers 4 and 5) were eliminated due to cost and associated adverse social and environmental effects. The remaining six plans were analyzed in detail; one plan (dubbed Plan 6) was subsequently identified as the agency-proposed action. In undertaking this study, Reclamation contracted with the firm of Dames and Moore to assist in defining and evaluating the alternative plans, and to prepare a draft environmental impact statement for the agency-proposed action. Archaeological Research Services, Inc., and the Arizona State University, Department of Anthropology (Office of Cultural Resource Management) were under subcontract to Dames and Moore for the historic and prehistoric cultural resource aspects of the CAWCS respectively. The historic cultural resource study was initiated in April, 1979, and concluded in December, 1981, and involved preparing reports and supporting documentation relative to each of the study stages above. For the purposes of this study, historic cultural resources are defined as those sites or properties which were occupied after the time at which written records became available for an area. As applied to the Southwestern United States, historic sites may include those in existence at or subsequent to the period of initial Spanish contact (during the 16th century).