Results from a previous USGS study on the characterization of salinity and selenium loading and land-use change in Montrose Arroyo from 1992 to 2010 indicated that there was no change in salinity load at site MA2 and a significant increase in dissolved-selenium load from the pre-lateral period to the post-growth period. Data associated with this report indicate the selenium loads at site MA2 show no significant change from the pre-lateral period to the post-growth period. In addition, both salinity load and dissolved-selenium load at site MA3 show significant decreases in salinity and dissolvedselenium load for both periods that are potentially associated with land-use change. Land use was characterized for 1992, 2002, and 2009 for site MA3. The common land-use change in the MA3 subwatershed was a conversion from previously irrigated agricultural land to urban land use. The MA3 subwatershed had 124 acres of irrigated land use converted to urban land use and 27.1 acres of unirrigated desert converted to urban land use from 1992 to 2009. Consistent with findings in previous landuse change reports, salinity and dissolved-selenium loading at site MA3 showed significant decreases as irrigated land was converted to urban land use.
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Map showing bed-material sampling locations. A, the Jensen mid-channel bar (spawning habitat), 5 miles downstream from the Green River near Jensen, Utah, streamflow-gaging station. B, 09261000, Green River near Jensen, Utah, streamflow-gaging station. C, 09152500, Gunnison River near Grand Junction, Colorado, streamflow-gaging station .
Conceptual models of sediment-retention ponds described in the text as A, salinity retention in sediment-retention ponds underlain by low-permeability sediments, B, salinity retention in sediment-retention ponds underlain by moderate-permeability sediments, C, salinity mobilization in sediment-retention ponds underlain by low-permeability sediments, and D, salinity mobilization in sediment-retention ponds underlain by moderate-permeability sediments .
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