Lower Arkansas Districts 10_14_17&67 Diversion Inventory

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September 15, 2004 Lower Arkansas River Basin Districts 10, 14, J 7 and 67 Diversion Structure Inventory 1.0 INTRODUCTION The Farnsworth Group was retained by the Colorado Water Conservation Board (eWCS) to evaluate and document the condition of raw water diversion structures along the Arkansas River from just downstream of the Pueblo Reservoir Dam in Pueblo, Colorado to the Kansas State line" The Lower Arkansas River Basin encompasses Districts 10, 14, 17 and 67. District 10 extends from west of Pueblo Reservoir to the east side of Pueblo on the north side of the river, and includes the evaluation of 3 diversion structures. District 14 extends from west of Pueblo Reservoir to the east side of Pueblo on the south side of the river, and from the east side of Pueblo to Fowler on both sides of the river. District 14 includes the evaluation of 11 diversion structures" District 17 extends from Fowler to the west or upstream end of John Martin Reservoir, and includes the evaluation of 8 diversion structures. District 67 extends from John Martin Reservoir to the Colorado-Kansas State line, and includes the evaluation of 9 diversion structures. See Appendix A for a summary of all structures evaluated, including ditch owner/rider contact information, detailed directions and coordinates to, and condition of, each structure. See Appendices S, C, D and E for field and photographic documentation, evaluation, and cost estimation for recommended repairs of structures in Districts 10, 14, 17 and 67, respectively" The structures are grouped by their district, and listed in order from upstream to downstream. An overall map of structure locations and district boundaries is included in the back pocket of this report. 2.0 RESEARCH AND PLANNING An initial condition report, structure names, directions to each diversion, GPS location and contact information were provided by the ewes. After reviewing this information, each structure's GPS location was plotted on U.S.G.S. Quadrangle Maps. These maps, in conjunction with a Colorado Atlas and the directions provided, were used to identify the locations and to plan an efficient route to each structure. In order to organize the notes taken during the field observation process, a Field Inventory form was created and utilized" This form allowed the observer to record detailed directions, coordinates, the type of structure, its condition, repair(s) needed, specific ideas on how to repair and any additional comments. 3.0 FIELD INVENTORY 3.1 General Once a structure was physically located, the approximate coordinates (latitude and longitude) of the diversion headwall were recorded using a hand-held GPS locator. Photographs were taken showing all the components of the structure from different vantages, visible damage, upstream and downstream river/ditch configurations, etc" The components of a structure would typically include: A" Diversion - Concrete structure used to divert water from the South Platte River to each ditch at a controlled rate (specific flow) by means of a headgate. The headgate is typically a manually, mechanically or electrically operated radial or vertical lift 9ate(s). The structure also consists of a }'arnsworth Group Page I