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USGS NRP Tucson: Sediment Impacts from Disturbed and Undisturbed Lands

The Vigil Network: Tributary to Hollowwood Creek

The Vigil Network: Tributary to Hollowwood Creek
Site Information

Site # MY – 21

Site location

The site is located south of highway 212, 6.5 miles west of the Tongue River brdge (west of Ashland).

Site Discussion

The stream is small and ephemeral, actually, a dry wash. The bottom of the wash is nearly flat grass-covered silt deposit. It appears that the channel has aggraded through silt deposition. There are places where the channel has been cut into the silt. Cross-section 2 crosses one such channel. It is about 10 meters long with steep banks and virtually no vegetation.

This area is heavily grazed by cattle and the grasses are very short, very brown, and very sparse.

Much of the terrace side on the right bank and some on the left bank is unvegetated, bare silt with small rills (about 0.05 m apart) cut into the silt.

There is no water here and there are no signs of water having occupied the channel recently (the vegetation in the bottom of the channel is just as brown as everywhere else).

About 15 meters upstream from cross-section 2, the first flat stream bottom pinches out, being replaced by another similar one. The second "terrace" is about 0.5 to 0.6 meter higher than the first (where they meet). They meet in a steep, bare escarpment, and the stream appears to be eroding headwardly into this higher "terrace".

Tributary to Hollowwood Creek (Site # MY-21) was surveyed 9/4/75.

Description of Benchmarks

Angles determined by a Brunton are followed by a (B), all others derived from plane table data. Distances determined with a tape are followed by a (T), all others found using the alidade. The rod is touching the alidade side of the survey point, and is centered. Compass compensation is 15.5 degrees. See Table 1.

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