Title
Shaw Butte Mountain Service Tower Access Road Drainage Improvement Project
Description
This report requests the Transportation, Infrastructure and Innovation Subcommittee recommend City Council approval to enter into Agreements with Maricopa County and Arizona Public Service (APS) for overall cost share for project development and implementation of the Shaw Butte Mountain Service Tower Access Road Drainage Improvement Project. The City's cost share for this project will not exceed $20,000.
THIS ITEM IS FOR CONSENT ACTION.
Report
Summary
The Heritage Highlands Homeowners Association (HOA) has experienced drainage long-term stormwater runoff from Shaw Butte Mountain park. The Heritage Highlands development backs up to Shaw Butte Mountain and stormwater runoff concentrates along the backyard walls of the development, which results in deposition of sediment and debris.
This drainage issue is magnified due to deferred maintenance of the Shaw Butte Mountain Service Tower Access Road, which through the last several years has experienced considerable erosion, thus directing greater stormwater runoff and sediment deposits towards the properties along Wood Drive adjacent to Shaw Butte Mountain. There are four affected properties along Wood Drive located on the north side of Shaw Butte Mountain, which is part of the greater Phoenix Mountains Preserve. The backyard walls border the Preserve boundary and are located at the base of the mountain. Runoff that accumulates is conveyed easterly along a drainage channel on the east side of West Wood Drive, which is owned by the Heritage Highlands HOA. The wash flows northerly across Wood Drive; eventually reaching the Moon Valley Wash north of Thunderbird Road.
The project consists of a new containment berm along the north edge of the Shaw Butte Mountain Service Tower Access Road, extending the existing containment berm easterly to the wash at the Shaw Butte Trailhead entrance. The proposed containment berm has a four-foot wide top width with side slopes along the access road.
Floodplain Management staff is recommending the Shaw Butte Mountain Service Tower Access Road Drainage Improvement Project be completed through a funding partnership between the City, Maricopa County and APS. The Shaw Butte Mountain Service Tower Access Road is primarily used by Maricopa County and APS.
Financial Impact
The overall project cost is approximately $80,000. The City's cost share is 25 percent ($20,000) and would be funded by the Street Transportation Department’s Capital Improvement Program. Through cost share agreements, Maricopa County will contribute 25 percent ($20,000); and APS will contribute 50 percent ($40,000).
Location
Shaw Butte Mountain Phoenix Preserve, vicinity of Central Avenue and Wood Drive.
Council District: 3
Department
Responsible Department
This item is submitted by Deputy City Managers Karen Peters, Inger Erickson and Mario Paniagua, and the Public Works, Parks and Recreation and Street Transportation departments.