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Last modified
1/26/2010 10:12:12 AM
Creation date
10/5/2006 4:56:30 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
299
County
Costilla
Community
Unincorporated Costilla County
Basin
Rio Grande
Title
Floodplain Information Report - for the Rio Grande, Trinchera Creek, Culebra Creek, Colstilla Creek, and Selected Tributaries in Costilla County
Date
3/1/1989
Designation Date
11/1/1989
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />and on to Texas. From the vicinity of El Paso it forms the <br />border between Texas and Mexico. The flow that remains after <br />irrigation diversions and reservoir storage enters the Gulf of <br />Mexico near Brownsville, Texas. <br /> <br />The Rio Grande is large enough that it is well defined <br />throughout the county. At the north end of the county. as it <br />flows south from Alamosa County, the river is broader and <br />flatter with a very wide floodplain, on the order of two or <br />three miles wide. Then in a stream distance of about two or <br />three miles the floodplain narrows substantially, to a width of <br />about 500 feet. Further south, the valley turns into a canyon <br />that is about 80 feet deep as the river enters New Mexico. On <br />the Rio Grande there are a few buildings in the northern part <br />of the county. Otherwise. to the south. very widely spaced <br />bridges are the only obstruction. <br /> <br />2.5 Trinchera Creek Basin <br /> <br />Trinchera Creek originates in the Sangre de Cristo <br />Mountains of northern Costilla County. Elevations are as high <br />as 14,345 feet. It flows generally to the west and southwest. <br />At its confluence with the Rio Grande the elevation is about <br />7.500 feet. <br /> <br />In the eastern part of the Trinchera Creek basin streams <br />are narrow and steep. Development in the floodplain has <br />consisted primarily of roads and bridges. In Fort Garland and <br />a few miles to the west several tributaries gradually join <br />Trinchera Creek to form a single major drainage. As Trinchera <br />Creek and its tributaries emerge from the foothills of the <br />Sangre de Cristo Mountains onto the alluvial plain of the <br />eastern San Luis Valley, the individual stream valleys become <br />broader and flatter. <br /> <br />Urbanization, mostly in and around Fort Garland. and <br />agricultural uses have led to streets, roads. houses, <br />commercial facilities, agricultural buildings and facilities. <br />and irrigation structures in and adjacent to Trinchera Creek <br />and its tributaries. This is the area where there is the most <br />extensive encroachment into the floodplain of Trinchera Creek <br />and its tributaries. <br /> <br />Fina11y, in the western part of the Trinchera Creek basin, <br />the single creek flow through agricultural areas or currently <br />undeveloped areas. The main channel and side channels are <br />poorly defined, and sometimes human activity has obliterated <br />them. Aside from highways, roads, bridges, and culverts, there <br />are few obstructions. <br /> <br /> <br />-12- <br />
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