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Chevelon Canyon Watershed – Arizona Rapid Watershed Assessment April 2007

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Chevelon Canyon Watershed – Arizona Rapid Watershed Assessment April 2007 NEMO Watershed Based Plan Little Colorado Watershed Item Type text; Report Authors Parra, Ivan; Reed, Mickey; vanderLeeuw, Elisabeth; Guertin, D. Phillip; Levick, Lainie R.; Uhlman, Kristine Download date 29/09/2021 18:05:50 Link to Item http://hdl.handle.net/10150/187320 Chevelon Canyon Watershed – Arizona Rapid Watershed Assessment April 2007 Prepared by: USDA Natural Resource Conservation Service – Arizona University of Arizona, Water Resources Research Center In cooperation with: Arizona Association of Conservation Districts Arizona Department of Agriculture Arizona Department of Environmental Quality Arizona Department of Water Resources Arizona Game & Fish Department Arizona State Land Department USDA Forest Service USDI Bureau of Land Management Released by: Sharon Megdal David McKay Director State Conservationist University of Arizona U.S. Department of Agriculture Water Resources Research Center Natural Resources Conservation Service Principle Investigators: Dino DeSimone – Natural Resources Conservation Service, Phoenix, Arizona Keith Larson – Natural Resources Conservation Service, Phoenix, Arizona Kristine Uhlman – Water Resources Research Center, University of Arizona D. Phil Guertin – School of Natural Resources, University of Arizona Deborah Young – Associate Director, Cooperative Extension, University of Arizona The United States Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, gender, religion, age, disability, political beliefs, sexual orientation, and marital or family status. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA’s TARGET Center at 202-720-2600 (voice and TDD). To file a complaint of discrimination, write USDA, Director, Office of Civil Rights, Room 326W, Whitten Building, 14th and Independence Avenue, SW, Washington, D.C., 20250-9410 or call (202) 720-5964 (voice or TDD). USDA is an equal employment opportunity provider and employer. Chevelon Canyon Watershed – An RWA can be used as a 15020010 communication tool between the Natural 8-Digit Hydrologic Unit Resources Conservation Service Rapid Watershed Assessment (NRCS) and partners for describing and prioritizing conservation work in selected watersheds. RWAs provide initial Section 1: Introduction estimates of conservation investments needed to address the identified Overview of Rapid Watershed resource concerns in the watershed. Assessments RWAs serve as a platform for conservation program delivery, provide A Rapid Watershed Assessment (RWA) useful information for development of is a concise report containing NRCS and Conservation District information on natural resource business plans, and lay a foundation for conditions and concerns within a future cooperative watershed planning. designated watershed. The "rapid" part refers to a relatively short time period to General Description of the Chevelon develop the report as compared to a Canyon Watershed more comprehensive watershed planning effort. The “assessment” part The Chevelon Canyon watershed is an refers to a report containing maps, eight-digit HUC subbasin located in the tables and other information sufficient to east-central portion of the state of give an overview of the watershed and Arizona, southeast of the town of for use as a building block for future Winslow and southwest of Holbrook planning. RWAs look at physical and (Figure 1-1). The basin comprises socioeconomic characteristics and 529,935 acres (828 square miles) and is trends, as well as current and future located in Navajo and Coconino conservation work. Counties. Sixty-four percent of the land is managed by the Forest Service, 28% The assessments involve the collection is private land, and 7% is state land. of readily available quantitative and The remaining 2% of the land is qualitative information to develop a managed by Bureau of Land watershed profile, and sufficient analysis Management (BLM) or Arizona Game & of that information to generate an Fish. appraisal of the conservation needs of the watershed. These assessments are Major towns in the watershed include conducted by conservation planners, Heber and Overgaard. The NRCS Field using Geographic Information System Offices for the area are located in (GIS) technology, assessing current Holbrook and Flagstaff. levels of resource management, identifying priority resource concerns, Conservation assistance is provided and making estimates of future through the Coconino and Navajo conservation work. Conservation County Natural Resource Conservation Districts and other local leaders, along Districts. with public land management agencies, are involved in the assessment process. Chevelon Canyon Watershed Rapid Watershed Assessment Section 1 - Introduction page 1- 1 The area ranges in elevation from 5,400 to 7,200 feet. Rainfall amounts in this area range from 10 to 20 inches per year. The area in lower elevations is made up of undulating plains and low hills, with an occasionally deeply incised, steep sided drainage way. Some buttes and mesas rise abruptly above the level of the plains. At higher elevation the landscape is generally made up of level plains with hills and low mountains. This area supports a mixture of forest and grassland plant communities. The majority of this watershed is used for cattle and sheep grazing. Rangeland and grazable forestland comprise over 90 percent of the area, while about 3 percent is used for cropland. The crops produced are corn, alfalfa, small grains and vegetable crops which are usually grown for local consumption. Scattered acreage of dry cropland occurs at the higher elevations. Resource concerns in the watershed include soil erosion, rangeland site stability, rangeland hydrologic cycle, excessive runoff (causing flooding or ponding), water quality concerns for ground water (pesticides, nutrients and organics) and surface water (pesticides, nutrients, organics, suspended sediment and turbidity), plant condition – productivity, health and vigor, noxious and invasive plants, wildfire hazard, fish and domestic animals – inadequate quantities and quality of feed, forage, and stock water. Chevelon Canyon Watershed Rapid Watershed Assessment Section 1 - Introduction page 1- 2 Section 2: Physical Description mostly level, horizontally stratified sedimentary rocks that have been Watershed Size eroded into canyons and plateaus, and by some high volcanic mountains. The Chevelon Canyon Watershed covers approximately 828 square miles, The edge of the Mogollon Rim exposes representing less than 1% of the state of a sequence, nearly 3,000 feet thick, of Arizona. The watershed has a Paleozoic sedimentary rocks (Parker maximum width of about 27 miles east- and Flynn, 2000). The overall vertical west, and a length of about 44 miles displacement of the Rim varies, but in north-south. some multiple fault zones near the Verde River it is estimated at The Chevelon Canyon Watershed was approximately 6,000 feet (Feth, et al. delineated by the U.S. Geological 1954). Continued subsidence along Survey and has been subdivided by the several fault zones eventually formed NRCS into smaller watersheds or the Chevelon Canyon Watershed, with drainage areas. Each drainage area the headwaters of Chevelon Canyon has a unique hydrologic unit code entrenched within one of the numerous (HUC) number and a name based on northwest – southeast trending vertical the primary surface water feature within faults forming the Rim escarpment. the HUC. These drainage areas can be further subdivided into even smaller Compared with the rest of Arizona watersheds as needed. The Chevelon geology, the Plateau Uplands seems Canyon Watershed has an 8-digit HUC easy to understand, the rocks are flat- of 15020010 and contains the following lying sedimentary strata set in 10-digit HUCs: sequences of oldest (bottom) to youngest (top). The Chevelon Canyon • 1502001001 (Upper Chevelon (formed by both vertical faulting and Canyon); creek down cutting) exposes the layered Paleozoic (245 million years old and • 1502001002 (Black Canyon); older) sedimentary rocks (rocks formed and, by sediment, e.g., rock fragments or particles of various sizes), which • 1502001003 (Lower Chevelon include: sandstone, shale, and Canyon) (Figure 1-2). limestone. These rocks are visible as orange to reddish ledgy outcrops cliffs Geology across the watershed. The Chevelon Canyon Watershed is on Shaly siltstones, mudstone, the down-dropped edge of the Mogollon conglomerates, and the Kaibab Rim escarpment, the southern boundary limestone overlay the Permian age of the Colorado Plateau Uplands Coconino Sandstone, and the older red physiographic province in the siltstone and fine sandstone rocks of the northeastern corner of the state. This Supai Formation are exposed in the province covers the northern 2/5 of the deep canyon. Ancient marine and state of Arizona and is characterized by coastal deposits include a wide range of Chevelon Canyon Watershed Rapid Watershed Assessment Section 2 – Physical Description page 2-1 rock types – limestone, claystone, are similar (NRCS 2006). It is mudstone, sandstone, and considered a subdivision of an existing conglomerate. Major Land Resource Area (MLRA). Landscape conditions, soil, climate, The 240 million year-old Moenkopi human considerations, and other natural formation can be traced from New resource information are used to Mexico,
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