Record Details
page 3-43
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 3-43 Diamond Fork System Final Supplement to the Final Environmental Impact Statement, page 3-43 |
| Coverage | Electronic reproduction; |
| Format | 3-43 text/PDF |
| Rights | Brigham Young University; http://lib.byu.edu/about/copyright/generic.php Public Domain Public |
| Language | English; eng; en |
| Relation | Central Utah Project; Western Waters Digital Library; wetland resources channels and in old oxbow cutoff channels species present include coyote willow cottonwood and red osier dogwood on mid elevation and high terraces and some tamarisk farming in the floodplain flood plain has been termAna terminated ted and grazing which is managed by the US forest service also has ended except for a few areas overall the corridor lacks riparian species age class and spatial diversity in particular there is a lack of intermediate class sizes of woody riparian vegetation combined with bare cutbanks cutbacks cut banks throughout most of the stream corridor riparian understory is absent or severely degraded and much of the mature cottonwood overstory has been lost as a result of farming up to the streambanks stream banks grazing and high prolonged annual flows that have not allowed the overstory to establish reestablish re immediately upstream of the highway 6 embankment over diamond fork creek there is a palustrine emergent marsh and aquatic bedopen bed open water community adjacent to the creek channel that covers approximately 6 acres this marsh was formed by the realignment of highway 6 following the landslide at thistle the highway 6 embankment constructed over diamond fork creek acts as a berm with water backing up and ponding bonding behind it 3452.4 34524 34524 spanish fork river spanish fork river is a perennial waterway with a single channel confined by steep canyon slopes highway 6 and the tracks of the denver and rio grande western railroad and the utah railroad the river gradually transitions from a canyon landform landford land form to a broad alluvial floodplain flood plain that extends to utah lake spanish fork river has conveyed irrigation water in addition to natural flows since 1913 consequently these irrigation flows have prevented establishment and persistence of riparian vegetation in portions of the canyon reach of spanish fork river the river has been divided into two primary reaches below to describe the affected environment 34524.1 345241 345241 spanish fork river from diamond fork creek to spanish fork diversion dam wetland and riparian habitats along this reach of spanish fork river exist in a fairly narrow corridor the river is channelized with little or no riparian vegetation wet meadow the largest wetland community occurs in the rivers active floodplain flood plain primarily at two different terrace elevations along the river these are 1 on gravel bars and low elevation terraces 0.4 04 04 to 1.3 13 13 feet above the river surface water elevation during the irrigation season june through september and 2 on high terraces 1.3 13 to 2.1 21 21 feet above the river water surface during the same period the wet meadow community along the gravel bars and low terraces is periodically inundated by 2 year and 10 loyear year flood events whereas the wet meadow community occurring on high terraces requires flood flows greater than the 10 year flood for inundation the wet meadow community transitions into a riparian shrub type at slightly higher elevations along this reach it is dominated by willow and tamarisk and is located an average of 2.3 23 23 to 3.3 33 33 feet above the summer water surface the 10 year flood primarily inundates the riparian shrub community but portions of the community located on higher terraces are only inundated during a 20 year flood event in addition to these community types a wet meadow type with saline adapted plant species is located immediately adjacent to the active spanish fork river channel small areas of creek bedriverine bed riverine type also are located immediately adjacent to the river A small amount of spikerush spik erush mudflat community type occurs at the normal waterline along point bars within 6 inches to 1 foot of the late suminer summer water surface inundated annually by a flow of 400 to 600 cfs cs this community type occurs adjacent to the river at cold springs and is dominated by emergent vegetation primarily cattail the palustrine emergent marsh type also occurs in overflow channels along the river that are inundated by 0.2 02 02 and 0.5 05 05 foot of water from may through july and inundated annually by a flow of 360 cfs cs 34524.2 345242 345242 spanish fork river from spanish fork diversion dam to utah lake this reach flows through lowland areas and is very constricted as a result of channelization down cutting and the creation of levees for flood 343 3 43 diamond fork system FSFEIS FS FEIS |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/8958 |
