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Accession Number PB2012-114734
Title Hydrologic Monitoring in Walnut Canyon National Monument. 2010-2011 Summary Report.
Publication Date Sep 2012
Media Count 21p
Personal Author E. S. Soles S. A. Monroe
Abstract Walnut Canyon National Monument (WACA) is located 6.4 km southeast of Flagstaff, Arizona, encompassing approximately 14.5 km2 (3,600 acres). Approximately 13 linear km of Walnut Creek trend from west to east within the monument. The canyon is eroded into the Kaibab Limestone and Coconino Sandstone in sinuous, entrenched meanders. It is typically 12 kilometer wide from north rim to south rim, and is 120 m (400 feet) from rim to floor at its deepest point. The canyon bottom is narrowly-incised within sandstone bedrock, where the Walnut Creek drainage meanders through shallow, coarse stream terrace deposits and talus blocks from the canyon walls. Upstream of the monument, the Walnut Creek watershed encompasses approximately 340 km2 (83,200 acres) to the south and west, which is mostly dominated by ponderosa pine (Pinus ponderosa) forest within the Coconino National Forest. Near the downstream end of the canyon, the Santa Fe Dam was built around 1885 to supply water to the Santa Fe Railway. In the 1930s local ranchers reportedly dynamited the dam, and in recent years streamflows readily leak through fractures in the dam or pass over the spillway. During rare flood flows, for short periods of time the canyon bottom is totally inundated for about 1.6 kilometers upstream of the dam, and this reach of the canyon is now filled with fine sediment deposits.
Keywords Bed rocks
National parks
Pine trees
Sediment deposits
Walnut Canyon National Monument
Water pollution monitoring
Water supplies

Source Agency National Park Service
NTIS Subject Category 48G - Hydrology & Limnology
48B - Natural Resource Management
68D - Water Pollution & Control
Corporate Author Northern Arizona Univ., Flagstaff.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1226
Contract Number N/A

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