GIS Data
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Revised Geologic Map of the Fort Garland Quadrangle, Costilla County, Colorado Revised Geologic Map of the Fort Garland Quadrangle, Costilla County, Colorado
The map area includes Fort Garland, Colo., and the surrounding area, which is primarily rural. Fort Garland was established in 1858 to protect settlers in the San Luis Valley, then part of the Territory of New Mexico. East of the town are the Garland mesas (basalt-covered tablelands), which are uplifted as horsts with the Central Sangre de Cristo fault zone. The map also includes the...
A New Perspective on Mount St. Helens - Dramatic Landform Change and Associated Hazards at the Most Active Volcano in the Cascade Range A New Perspective on Mount St. Helens - Dramatic Landform Change and Associated Hazards at the Most Active Volcano in the Cascade Range
Mount St. Helens has erupted more frequently than any other volcano in the Cascade Range during the past 4,000 years. The volcano has exhibited a variety of eruption styles?explosive eruptions of pumice and ash, slow but continuous extrusions of viscous lava, and eruptions of fluid lava. Evidence of the volcano?s older eruptions is recorded in the rocks that build and the deposits that...
Sedimentation Survey of Lago La Plata, Puerto Rico, July 2006 Sedimentation Survey of Lago La Plata, Puerto Rico, July 2006
Lago La Plata dam is located between the municipalities of Naranjito and Toa Alta in north central Puerto Rico, about 5 kilometers south of the town of Toa Alta and about 5 kilometers north of the town of Naranjito. The reservoir impounds the waters of the Rio de La Plata, the Rio Guadiana, and the Rio Ca?as, and is part of the San Juan Metropolitan Water District, which provides about...
Map Showing Limits of Tahoe Glaciation in Sequoia and Kings Canyon National Parks, California Map Showing Limits of Tahoe Glaciation in Sequoia and Kings Canyon National Parks, California
The latest periods of extensive ice cover in the Sierra Nevada include the Tahoe glaciation followed by the Tioga glaciation, and evidence for these ice ages is widespread in the Sequoia and Kings Canyon National Parks area. However, the timing of the advances and retreats of the glaciers during the periods of glaciation continues to be a matter of debate. A compilation of existing work...
Comparison of storage capacity and sedimentation trends of Lago Guayabal, Puerto Rico-December 2001 and October 2006 Comparison of storage capacity and sedimentation trends of Lago Guayabal, Puerto Rico-December 2001 and October 2006
Lago Guayabal dam is located on the Río Jacaguas in the municipality of Villalba in southern Puerto Rico, about 4 kilometers north of the town of Juana Díaz and about 5 kilometers south of Villalba (fig. 1). The dam is owned and operated by the Puerto Rico Electric Power Authority (PREPA) and was constructed in 1913 for the irrigation of croplands in the southern coastal plains of Puerto...
Flood-plain study of the Upper Iowa River in the vicinity of Decorah, Iowa Flood-plain study of the Upper Iowa River in the vicinity of Decorah, Iowa
The city of Decorah, Iowa, has experienced severe flooding from the Upper Iowa River resulting in property damage to homes and businesses. Streamflow data from two U.S. Geological Survey (USGS) streamflow-gaging stations, the Upper Iowa River at Decorah, Iowa (station number 05387500), located upstream from the College Drive bridge; and the Upper Iowa River near Decorah, Iowa (station...