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Rainfall on 9–13 September 2013 triggered at least 1,138 debris flows in a 3430 km 2 area of the Colorado Front Range. Most flows were triggered in response to two intense rainfall periods, one 12.5-hour-long period on 11–12 September, and one 8-hour-long period on 12 September. Data in this project pertain to an area bounded by N 40.0° – 40.375° and W 105.25° – 105.625° which includes many of the areas where high concentrations of debris flows occurred. These data include a subset of a map of landslide and debris flow scarps (Coe and others, 2014) and raster grids derived from the National Elevation Dataset. These data were used to test a new, parallel implementation of the Transient Rainfall Infiltration and...
On 28 July 1999, about 480 alpine debris flows were triggered by an afternoon thunderstorm along the Continental Divide in Clear Creek and Summit counties in the central Front Range of Colorado. The thunderstorm produced about 43 mm of rain in 4 h, 35 mm of which fell in the first 2 h. Several debris flows triggered by the storm impacted Interstate Highway 70, U.S. Highway 6, and the Arapahoe Basin ski area. We mapped the debris flows from color aerial photography and inspected many of them in the field. Three processes initiated debris flows. The first process initiated 11% of the debris flows and involved the mobilization of shallow landslides in thick, often well vegetated, colluvium. The second process, which...
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The consequence of the 1996 Buffalo Creek wildfire disturbance and a subsequent high-intensity summer convective rain storm (~100 mm h-1) was the deposition of a sediment superslug in the Spring Creek basin (26.8 km2) of the Front Range Mountains in Colorado. Changes in the superslug near the confluence of Spring Creek with the South Platte River were monitored by cross-section surveys at 18 nearly equally-spaced cross sections along a 1500 m study reach for 18 years (1996-2014) to understand the evolution and internal stratigraphy of this type of disturbance in response to different geomorphic processes. These data consist of 18 Excel files (one for each cross section) containing worksheets corresponding to each...
The forest vegetation of the northern Colorado Front Range was studied using a combination of gradient analysis and classification methods. A graphical model of forest composition based on elevation and topographic-moisture gradients was constructed using 305 0.1 ha samples. To derive the topographic-moisture gradient, stands were stratified into eight 200 m elevation belts, and then ordinated by correspondence analysis using understory (<1 m) data. Each of the resultant gradients was scaled against a standard site moisture scalar derived from incident solar radiation and topographic position. Except for krummholz sites, the vegetation defined gradients fit the moisture scalar closely. Once scaled, these gradients...
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Explanation: Advances in various technologies have enabled increased accuracies, higher resolutions, and reduced costs for elevation data acquired using airborne IFSAR (Interferometric Synthetic Aperture RADAR) and LIDAR (Light Detection and Ranging) technologies. Associated IFSAR magnitude (RADAR DOQ) data also offers improved resolution, dynamic range, and reduced noise over earlier systems. The USGS acquired IFSAR coverage for the Colorado Front Range area in 1999, and is evaluating both IFSAR and LIDAR for its Data Revision program. In this poster the IFSAR DEM (phase difference of return pulses) for the entire study area has been displayed in graytone shaded relief. Procedures used: After paneling all...
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Thirty-nine types of surficial geologic deposits and residualmaterials of Quaternary age are described and mapped in the greaterDenver area, in part of the Front Range, and in the piedmont andplains east of Denver, Boulder, and Castle Rock. Descriptionsappear in the pamphlet that accompanies the map. Landslidedeposits, colluvium, residuum, alluvium, and other deposits ormaterials are described in terms of predominant grain size, mineralor rock composition (e.g., gypsiferous, calcareous, granitic,andesitic), thickness of deposits, and other physicalcharacteristics. Origins and ages of the deposits and geologichazards related to them are noted. Many lines between geologicunits on our map were placed by generalizing...
Tags: gravel, Watkins, 08031 = Denver, 08049 = Grand, 08059 = Jefferson, All tags...
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Explanation: Advances in various technologies have enabled increased accuracies, higher resolutions, and reduced costs for elevation data acquired using airborne IFSAR (Interferometric Synthetic Aperture RADAR) and LIDAR (Light Detection and Ranging) technologies. Associated IFSAR magnitude (RADAR DOQ) data also offers improved resolution, dynamic range, and reduced noise over earlier systems. The USGS acquired IFSAR coverage for the Colorado Front Range area in 1999, and is evaluating both IFSAR and LIDAR for its Data Revision program. In this poster the IFSAR DEM (phase difference of return pulses) for the entire study area of 72 7.5-minute USGS quadrangles has been displayed in graytone shaded relief. ...
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Draft color shaded relief map of Colorado made by assembing NED tiles from 2004. An inset map of the Front Range region is included. Selected boundaries, cities, counties, highways, and hydrography are also shown.
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Abstract Data Fifty-three types of surficial geologic deposits and residual materials of Quaternary age are described in a pamphlet and located on a map of the greater Pueblo area, in part of the Front Range, in the Wet and Sangre de Cristo Mountains, and on the plains east of Colorado Springs and Pueblo. Deposits formed by landslides, wind, and glaciers, as well as colluvium, residuum, alluvium, and others are described in terms of predominant grain size, mineral or rock composition (e.g., gypsiferous, calcareous, granitic, andesitic), thickness, and other physical characteristics. Origins and ages of the deposits and geologic hazards related to them are noted. Many lines drawn between units on our map were placed...
Categories: Web Site; Tags: expansive clay, bedrock, Lincoln County, till, soil, All tags...
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This 1:50,000-scale geologic map represents a compilation of the most recent geologic studies of the upper Arkansas River valley, between Leadville and Salida, Colorado. The valley is structurally controlled by an extensional fault system that forms part of the prominent northern Rio Grande rift, an intra-continental region of crustal extension. This work also incorporates new detailed geologic mapping of poorly understood areas within the map area and reinterprets previously studied areas, aided by lidar data that covers 59 percent of the map area. The mapped region extends into the Proterozoic metamorphic and intrusive rocks in the Sawatch Range west of the valley and the Mosquito Range to the east. Paleozoic...
Categories: Data; Tags: Gordon Mine, leucogranite gneiss, landslide deposits, Cottonwood Creek, Iowa Gulch, All tags...
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Explanation: Advances in various technologies have enabled increased accuracies, higher resolutions, and reduced costs for elevation data acquired using airborne IFSAR (Interferometric Synthetic Aperture RADAR) and LIDAR (Light Detection and Ranging) technologies. Associated IFSAR magnitude (RADAR DOQ) data also offers improved resolution, dynamic range, and reduced noise over earlier systems. The USGS acquired IFSAR coverage for the Colorado Front Range area in 1999, and is evaluating both IFSAR and LIDAR for its Data Revision program. The IFSAR DEM (phase difference of return pulses) and DOQ (magnitude of return) datasets for the entire study area have been merged together and displayed in such a way to depict...
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Fifty-three types of surficial geologic deposits and residual materials of Quaternary age are described in a pamphlet and located on a map of the greater Pueblo area, in part of the Front Range, in the Wet and Sangre de Cristo Mountains, and on the plains east of Colorado Springs and Pueblo. Deposits formed by landslides, wind, and glaciers, as well as colluvium, residuum, alluvium, and others are described in terms of predominant grain size, mineral or rock composition (e.g., gypsiferous, calcareous, granitic, andesitic), thickness, and other physical characteristics. Origins and ages of the deposits and geologic hazards related to them are noted. Many lines drawn between units on our map were placed by generalizing...
Tags: gravel, 08049 = Grand, Florissant, 08025 = Crowley, San Luis Valley, All tags...
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This data release consists of four Excel files (one for each cross section) containing worksheets corresponding to each channel cross-section survey (~25-31) between 1996 and 2014. These worksheets contain the basic survey data (dates, instruments, reference elevations, foresights, distances from reference pins, and elevations). An additional worksheet contains the measured unit-volume (m^3/m) of chronostratigraphic units deposited during the time interval between two sequential surveys and the unit-volumes of each chronostratigraphic unit eroded during the same time interval. A final worksheet contains the age and transit-time distributions for selected surveys.


    map background search result map search result map Generalized Surficial Geologic Map of the Pueblo 1� x 2� Quadrangle, Colorado Generalized Surficial Geologic Map of the Denver 1�x2� Quadrangle, Colorado Generalized Surficial Geologic Map of the Pueblo 1� x 2� Quadrangle, Colorado (Draft poster)  Colorado Front Range:  IFSAR (Radar) Topography (Draft poster)  IFSAR Color Relief of Colorado Front Range:  5-meter IFSAR DEM merged with 2.5-meter IFSAR DOQ (Draft poster)  IFSAR DEMs:  All 72 Colorado Front Range Quads Color Shaded Relief Map of Colorado with Front Range Inset  (Draft Map) Eighteen years (1996-2014) of channel cross-sectional measurements made in Spring Creek after the 1996 Buffalo Creek wildfire and subsequent flood Residence Times and Alluvial Architecture of a Sediment Superslug in Response to Different Flow Regimes in Spring Creek (1996-2016) Data release for the geologic map of the upper Arkansas River valley region, north-central Colorado Eighteen years (1996-2014) of channel cross-sectional measurements made in Spring Creek after the 1996 Buffalo Creek wildfire and subsequent flood Residence Times and Alluvial Architecture of a Sediment Superslug in Response to Different Flow Regimes in Spring Creek (1996-2016) Data release for the geologic map of the upper Arkansas River valley region, north-central Colorado (Draft poster)  Colorado Front Range:  IFSAR (Radar) Topography (Draft poster)  IFSAR DEMs:  All 72 Colorado Front Range Quads (Draft poster)  IFSAR Color Relief of Colorado Front Range:  5-meter IFSAR DEM merged with 2.5-meter IFSAR DOQ Generalized Surficial Geologic Map of the Pueblo 1� x 2� Quadrangle, Colorado Generalized Surficial Geologic Map of the Denver 1�x2� Quadrangle, Colorado Generalized Surficial Geologic Map of the Pueblo 1� x 2� Quadrangle, Colorado Color Shaded Relief Map of Colorado with Front Range Inset  (Draft Map)