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Aging infrastructure is creating a pressing national need to align priorities between civil engineering and other interests. Restoring ecological connectivity of river networks that are fragmented by dams and road crossings has become a prominent objective for environmental managers across the country. A mature decision-support framework and newly available data on the condition of dams throughout the Lake Michigan basin offer unique opportunities to test for potential cost-efficiency gains from sharing the costs of removing decrepit dams between environmental and engineering organizations. At sites where these interests align, genuine win-win scenarios could advance both ecological connectivity and infrastructure...
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Album caption: Blackstone River Valley, looking upstream below the dam at Blackstone, showing the stony bed with pothole in one ledge. Most of the water is now diverted to another channel. Blackstone quadrangle. September 26, 1906.( Sun, 11:15 a.m., Ex. 1, D 8, double lens, color screen, underexposed.) Handwritten note on album caption: Worcester Co. Massachusetts.
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Album caption: Downstream face of Brush Dam across Pecos River above Grandfalls. Ward Co., Texas. No index card.
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The importance of riparian ecosystems in semiarid and arid regions has generated interest in understanding processes that drive the distribution and abundance of dominant riparian plants. Changes in streamflow patterns downstream of dams have profoundly affected riparian vegetation composition and structure. For example, in the southwestern United States, flow regulation has contributed to the replacement of many riparian forests historically dominated by the native Populus fremontii (Fremont Cottonwood) and Salix gooddingii (Goodding’s Willow) by the exotic species Tamarix spp. (Salt Cedar). The proposed project will help guide reservoir release decision making to enhance downstream recruitment of native cottonwood...
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Executive Summary: Evolution of policies that guide operation of individual reservoir systems begins with a relative flurry of activity associated with building of dams. Over perhaps a ten year period, operations are proposed in anticipation of construction, implemented when a dam is complete, and then modified as the effects, capabilities, and limitations of the project become better understood. After these initial adjustments, the policy process slowly begins to simmer. Operational changes are the driven by short-term influences that are largely episodic (e.g. droughts and floods) and long-term influences (e.g. social and economic factors) that affect operations more gradually.
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Face of dam ("Barrier No. 1") after floods of 1904-05. Concrete scoured by transported debris. Pile head (foreground) more resistant than concrete. Yuba County (?), California. August 22, 1905.
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Album caption: Blackstone River Valley. Pothole containing a nest of pebbles, bed of Blackstone River at Blackstone. River at Blackstone, below the dam. Blankstone quadrangle, Massachusetts. September 26, 1906. Handwritten note on album caption: Worcester Co.
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Album caption: Downstream face of Brush Dam across Pecos River above Grandfalls. Ward Co., Texas. No index card.
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Barrier No. 1, Yuba River. The water flows over part of dam built in 1904. The piles are part of the addition of 1905. Yuba County (?), California. June 6, 1905.
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Album caption: View of eastern end of Laguna Dam site. Summer of 1906. Yuma Co., Arizona. No index card available.
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The Oregon Fish Passage Barrier Data Standard (OFPBDS) dataset contains barriers to fish passage in Oregon watercourses. Barriers include the following types of natural or artificial structures: bridges, cascades, culverts, dams, debris jams, fords, natural falls, tide gates, and weirs. The OFPBDS dataset does not include structures which are not associated with in-stream features (such as dikes, levees or berms). Barriers are structures which do, or potentially may, impede fish movement and migration. Barriers can be known to cause complete or partial blockage to fish passage, or they can be completely passable, or they may have an unknown passage status. The third publication of the OFPBDS dataset (Version 3)...
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Conclusions: Watersheds with low indices of biotic integrity (IBI) have been heavily developed. The biggest factors contributing to low IBIs were the presence of large dams, introduced fish, and road density. Dams at low to middle elevations had the greatest effect on IBI. Thresholds/Learnings: Dams at low to middle elevations had the greatest effect on IBI. Synopsis: Researchers developed a watershed index of biotic integrity to evaluate the biological health of 100 watersheds in the Sierra Nevada of California. In general, watersheds with low indices of biotic integrity (IBI) have been heavily developed by hydraulic mining, agriculture, and hydroelectric dams. The biggest factors contributing to low IBIs were...
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Album caption: View of St. Francis Dam before failure. Los Angeles County, California. n.d. (Courtesy of Los Angeles Bureau of Power and Light). Index card: View of St. Francis Dam before failure. Los Angeles County, California. n.d.
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Album caption: Power scraper at work on Laguna Dam above Yuma, summer of 1906. Yuma Co., Arizona. No index card available.
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Album caption: The Lakeview Gusher, Midway oilfield, California, October 2, 1910. Index card: Near views of the Lakeview gusher, Midway Oil Fields. View includes part of the sandbag forming reservoir around gusher. Midway oilfield. Kern County, California. Note: Published as plate XLIII-C in U.S. Geological Survey. Professional paper 116. 1920.
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Album caption: Crest of submerged dam. Santiago Canyon. Orange Co., Calif. Handwritten notes on album caption: 1910 No index card available.
map background search result map search result map Oregon Fish Passage Barriers Blackstone River Valley, looking upstream below the dam at Blackstone, showing the stony bed with pothole in one ledge. Blackstone River Valley. Pothole containing a nest of pebbles, bed of Blackstone River at Blackstone. Massachusetts. 1906. Barrier No. 1, Yuba River. The water flows over part of dam built in 1904. Yuba County (?), California. 1905. Face of dam ("Barrier No. 1") after floods of 1904-05. Yuba County (?), California. 1905. Landslide(?) damage to lower Van Norman Dam. San Fernando, California, Earthquake February 1971. 1971. Landslide and other damage at lower Van Norman Dam. San Fernando, California, Earthquake February 1971. 1971. Crest of submerged dam, Santiago Canyon. Orange County, California. 1910. Power scraper at work on Laguna Dam above Yuma. Yuma County, Arizona. 1906. View of eastern end of Laguna Dam site. Yuma County, Arizona.1906. Downstream face of Brush Dam across Pecos River above Grandfalls. Ward County, Texas. n.d. Downstream face of Brush Dam across Pecos River above Grandfalls. Ward County, Texas. n.d. The Lakeview Gusher, Midway Oil Fields. Kern County, California. 1910. St. Francis Dam before failure, Los Angeles County, California. n.d. View along Snake River and bank below Twin Falls dam site. Twin Falls and Jerome counties, Idaho. circa 1903. Construction at south channel, Twin Falls dam site, Snake River. Twin Falls and Jerome counties, Idaho. 1903. Evaluating the biotic integrity of watersheds in the Sierra Nevada, California. Managing water and riparian habitats on the Bill Williams River with scientific benefit for other desert river systems Resources: Managing water and riparian habitats on the Bill Williams River with scientific benefit for other desert river systems Optimization at the infrastructure-connectivity nexus: boosting cost-efficiency of restoration using dam condition data for Lake Michigan Landslide(?) damage to lower Van Norman Dam. San Fernando, California, Earthquake February 1971. 1971. Landslide and other damage at lower Van Norman Dam. San Fernando, California, Earthquake February 1971. 1971. Barrier No. 1, Yuba River. The water flows over part of dam built in 1904. Yuba County (?), California. 1905. Face of dam ("Barrier No. 1") after floods of 1904-05. Yuba County (?), California. 1905. Blackstone River Valley, looking upstream below the dam at Blackstone, showing the stony bed with pothole in one ledge. Blackstone River Valley. Pothole containing a nest of pebbles, bed of Blackstone River at Blackstone. Massachusetts. 1906. Managing water and riparian habitats on the Bill Williams River with scientific benefit for other desert river systems Resources: Managing water and riparian habitats on the Bill Williams River with scientific benefit for other desert river systems View along Snake River and bank below Twin Falls dam site. Twin Falls and Jerome counties, Idaho. circa 1903. Construction at south channel, Twin Falls dam site, Snake River. Twin Falls and Jerome counties, Idaho. 1903. St. Francis Dam before failure, Los Angeles County, California. n.d. Optimization at the infrastructure-connectivity nexus: boosting cost-efficiency of restoration using dam condition data for Lake Michigan Evaluating the biotic integrity of watersheds in the Sierra Nevada, California. Power scraper at work on Laguna Dam above Yuma. Yuma County, Arizona. 1906. View of eastern end of Laguna Dam site. Yuma County, Arizona.1906. Oregon Fish Passage Barriers Crest of submerged dam, Santiago Canyon. Orange County, California. 1910. The Lakeview Gusher, Midway Oil Fields. Kern County, California. 1910. Downstream face of Brush Dam across Pecos River above Grandfalls. Ward County, Texas. n.d. Downstream face of Brush Dam across Pecos River above Grandfalls. Ward County, Texas. n.d.