Documentation of Historic Transmission Towers in the Eastern Mining Area Transmission System - Tonto National Forest and Tonto National Monument, Arizona
Creators: name: Chipman, Daryl
name: Garcia, Daniel
Publisher: name: (:unav)
Year: 2021
Subjects: subject: Tonto National Forest
valueUri: https://core.tdar.org/browse/geographic-keyword/223/tonto-national-forest
subject: Tonto National Monument
valueUri: https://core.tdar.org/browse/geographic-keyword/83234/tonto-national-monument
subject: Historic
valueUri: https://core.tdar.org/browse/culture-keyword/25/historic
subject: Lattice Steel Tower
valueUri: https://core.tdar.org/browse/other-keyword/169135/lattice-steel-tower
subject: US Wind Engine and Pump Company
valueUri: https://core.tdar.org/browse/other-keyword/169136/us-wind-engine-and-pump-company
subject: Creosote
valueUri: https://core.tdar.org/browse/other-keyword/169133/creosote
subject: Windmill Taper
valueUri: https://core.tdar.org/browse/other-keyword/169134/windmill-taper
subject: Concrete Footer
valueUri: https://core.tdar.org/browse/other-keyword/169137/concrete-footer
subject: Salt River Valley Water Users' Association
valueUri: https://core.tdar.org/browse/other-keyword/151286/salt-river-valley-water-users-association
subject: Transmission Line
valueUri: https://core.tdar.org/browse/other-keyword/572/transmission-line
subject: SRP's Eastern Mining Area115kV System
valueUri: https://core.tdar.org/browse/other-keyword/169119/srps-eastern-mining-area115kv-system
subject: Wooden H-frame
valueUri: https://core.tdar.org/browse/other-keyword/169120/wooden-h-frame
subject: Box Star Tower
valueUri: https://core.tdar.org/browse/other-keyword/169123/box-star-tower
subject: Box Vee Tower
valueUri: https://core.tdar.org/browse/other-keyword/169124/box-vee-tower
subject: United States Reclamation Service
valueUri: https://core.tdar.org/browse/other-keyword/147073/united-states-reclamation-service
subject: Double Tower
valueUri: https://core.tdar.org/browse/other-keyword/169121/double-tower
subject: Box Top Double Tower
valueUri: https://core.tdar.org/browse/other-keyword/169122/box-top-double-tower
subject: Knee Brace
valueUri: https://core.tdar.org/browse/other-keyword/169127/knee-brace
subject: Lightning Arresters
valueUri: https://core.tdar.org/browse/other-keyword/169128/lightning-arresters
subject: Storm Guys
valueUri: https://core.tdar.org/browse/other-keyword/169125/storm-guys
subject: Crossarm
valueUri: https://core.tdar.org/browse/other-keyword/169126/crossarm
subject: Grounding Conductor
valueUri: https://core.tdar.org/browse/other-keyword/169131/grounding-conductor
subject: Guy Anchor
valueUri: https://core.tdar.org/browse/other-keyword/169132/guy-anchor
subject: Static Wire
valueUri: https://core.tdar.org/browse/other-keyword/169129/static-wire
subject: Insulator
valueUri: https://core.tdar.org/browse/other-keyword/11532/insulator
subject: Shield Wire
valueUri: https://core.tdar.org/browse/other-keyword/169130/shield-wire

description: Beginning in 2021, Salt River Project (SRP) will replace substandard historic-age lattice tower structures along the 130-mile-long Eastern Mining Area (EMA) 115 kilovolt (kV) transmission system located on the Tonto National Forest and Tonto National Monument. The work is necessary to maintain reliability and safety of the EMA system and is being conducted to meet the requirements of the National Electrical Safety Code and the North American Electric Reliability Corporation (NERC), acting under authority from the Federal Energy Regulatory Commission. The existing historic structures would be replaced with new structures in the immediate vicinity of the original structure. As the lead federal agency, Tonto National Forest determined that the EMA system as a whole is eligible for inclusion in the National Register of Historic Places and that tower replacement would result in an adverse effect to the National Register-eligible system. In order to resolve the adverse effect, in 2020 a programmatic agreement1 was implemented and stipulated that 24 historic towers would be subject to documentation to record the six standard structure types and a sample of 18 representative deviations from the standard design, with an emphasis on documenting the variability of structural foundations.