Filters: Tags: San Juan River (X) > Types: Citation (X)
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Cosmogenic 26Al and 10Be in alluvial gravel on a strath 150 m above the San Juan River, Utah, reveal a depositional age of 1.36 +0.20 -0.15 Ma. This gravel is correlative with a series of terraces that grade to Glen Canyon on the Colorado River, indicating a similar age for incision there. The calculated incision rate, 110 {+/-} 14 m/m.y., is somewhat slower than that of the Colorado River in the eastern Grand Canyon and suggests active steepening of the Colorado River. The cosmogenic nuclides also indicate rapid erosion in the sediment source area and are consistent with alluviation due to enhanced Pleistocene erosion in the San Juan Mountains. Published in Geology, volume 32, issue 9, on pages 749 - 749, in 2004.
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Colorado River,
Geology,
San Juan River,
burial age,
cosmogenic,
Navajo Reservoir on the San Juan River serves as a water storage, flood control and power generation project for the San Juan River Basin. Because of deep hypolimnetic release from the dam, water temperatures are cooler than natural pre-dam conditions. Post-dam release water temperatures during the summer months are 4-8 �C (39-46 �F) as compared to pre-dam temperatures of 20-25 �C (68-77 �F). Colder water temperatures from the dam to Shiprock (~80 mile; 129 km downstream of the dam) may negatively impact survival of native fish species living below the dam but benefit the tail-water trout fishery (Vanicek, 1967; Holden, 1973; USBR, 2003). Colorado pikeminnow and razorback sucker are endangered fish species native...
Categories: Publication;
Types: Citation;
Tags: Navajo Reservoir,
San Juan River,
San Juan River system,
reservoir temperature,
temperature control device,
Two unique datasets were gathered to document whether flow management for hydropower affects the abundance and diversity of aquatic insect assemblages. The first dataset was collected in Grand Canyon from 2012-2014 by citizen scientists rafting the Colorado River. Simple light traps were set out each night in camp and used to capture the adult life stages of aquatic insects that emerged from the Colorado River. Three aquatic insect taxa were captured in sufficient abundance to analyze statistically including midges (order Diptera, family Chironomidae), micro-caddisflies (order Trichoptera, family Hydroptilidae), and blackflies (order Diptera, family Simuliidae, principally Simulium arcticum). These data were used...
This data is a compilation of fishery monitoring data collected by state agencies over several decades in tailwaters downriver of dams in Colorado, Utah, Montana, Wyoming, Idaho, New Mexico, Arizona, California, and Oregon. Specifically, the data contained herein is summary data used in four generalized linear mixed models that were developed to assess the biological and hydrologic factors that influence rainbow and brown trout recruitment and adult size in tailwaters across the western United States.
Categories: Data;
Types: Citation;
Tags: Anderson Ranch dam,
Beaverhead River,
Bighorn River,
Blue River,
Boysen dam,
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