Spencer Canyon Bank
Constructed for: Hualapai Natural Resources
Project purpose: To protect the existing composting
toilet and reduce bank erosion near the river.
Work Commenced: April 9th, 2007
Work Completed: April 16th, 2007
In 2007 a beach stabilization project was initiated at Spencer Canyon within the lower granite gorge of the Grand Canyon, Hualapai Reservation to protect the limited availability of beach area, preserve access to an existing composting toilet which helps to reduce non-point source pollution, and to restore the riparian habitat vegetation through invasive species removal.
Activities included the following;
Tamarisk Removal: Tamarisk trees were sawed off at the base, while leaving the roots in the ground for temporary bank stability along 180 feet of the bank, and 20 feet back from the bank edge.
Bank Sloping to stabilize beaches: Banks were laid back by hand crews to a stable 2:1 slope to increase willow establishment and reduce erosion potential.
Excavation of Willow Trench for planting: Crews excavated a trench along the sloped bank approximately 4 feet deep by 2 feet wide for willow plantings.
Willow Harvesting: Crews selectively harvested willows from the area. Forty-four willows over 20 feet long were harvested for vertical bundles and 475 willows between 5 and 6 feet long were harvested for trench plantings.
Species harvested and planted in the area:
Coyote willow (Salix exigua)
Seep willow (Baccharis salicipholia)
Goodding's willow (Salix gooddingii)
Willow Planting for Riparian Habitat Restoration: Approximately 4.5 willow poles were planted per foot in the 180 foot trench. Three hundred willows were harvested by the Hualapai DNR and planted with the 475 wild harvested poles. Short vertical bundles were buried into the bank equidistant from the long vertical bundles. Twenty short vertical bundles were planted. Crews replaced the trench spoils to 1 foot below ground level.
here for full report)
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