Under the sponsorship of the Bureau of Reclamation, the New Waddell Dam Borrow Areas Mitigative Data Recovery Project, more simply known as the Waddell Project, performed data recovery at 17 sites in the vicinity of Lake Pleasant, Arizona. Supplemental surveys conducted under the same contract added two sites to the inventory slated for investigation. The project area, composed of multiple survey areas, was spread across two drainages, the Agua Fria and New River, in what is considered the northern periphery of the prehistoric Hohokam culture. The sites studied included large agricultural fields, sometimes with associated surface masonry field houses; farmsteads with small numbers of pithouses; resource procurement and processing sites; and a single special-purpose crematory site. Research efforts were organized into three broad topic areas so that all project researchers, including specialists, could gear their investigations along the same lines. At the intra-drainage level, the focus was on the individual sites and their locations with respect to the physical environment and each other. Terminology employed for agricultural features and systems in the literature was reviewed and it was proposed that the use of terms be standardized. The topographic situation, source of water (e.g., river. wash, and/or runoff), and soil conditions were identified for the different agricultural systems investigated. The functions of the various agricultural feature types were assessed. It was found, for example, that linear rock alignments tend to slow the flow of water across the fields and/or direct the flow from one portion of a field to another. A model of the development of an agricultural system was employed that helps account for the functions of certain enigmatic features (i.e., field stones) and aspects of features (i.e., gaps between rocks in alignments). Contemporaneity of sites was difficult to establish as dating was less than satisfactory, but it was possible to discern differences between one early site (primarily Colonial period) and several later sites that appeared to form a late Sacaton-Soho phase community. At the inter-drainage level, a comparison of patterns at project sites in the two drainages was made to assess whether the drainages had been used by the same or different populations and whether specialization in subsistence resources had occurred as suggested by survey evidence. Results of ceramic and ground stone petrographic analyses as well as ethnobotanical analyses suggested the areas had been used by distinct populations and that although corn cultivation was universal, agave cultivation took place in the Agua Fria, but not the New River, drainage. Evidence also suggested that the New River study area had been used seasonally, whereas a strong case could be made for year-round occupation of the Agua Fria study area during the later time periods. At the inter-regional level, we studied how our sites fit with those surrounding them in the northern periphery and farther afield in both the Hohokam core area and northern Arizona. Differences found between the two study areas at the inter-drainage level were used to suggest that they had different focal sites. The Beardsley Canal site was identified as a prime candidate for the Agua Fria study area's focal site and AZ T:4:10 (ASM) was suggested as the hub for the New River study area. Little, if any, contact was indicated between sites in the New River study area investigated by ACS and those to the south examined earlier by Soil Systems Inc. Based on the decrease over time in the frequencies of artifacts of Hohokam derivation (i.e., buff ware ceramics, schist palettes, and shell artifacts), it was obvious that ties with the Hohokam core area decreased concomitant with an increase in exchange with northern Arizona populations. probably those in the Prescott area. Note that the volumes are included here as one file.