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Topic: Old River Control Structure

	Old River Control (Site not responding. Last check: 2007-10-11)
		At the location we now call Old River, about 314 miles from the river's mouth, there was a loop in the river not unlike the New Madrid loop today.
		When Henry was finished, the Red River flowed into the Atchafalaya and Old River, which used to be the bottom half of the loop, flowed out of the Mississippi and into the Atchafalaya.
		The river claimed the southern wing wall of the structure, and nearly undermined its foundation which is sunk ninety feet into the river bottom.
	users.stlcc.edu /jangert/oldriver/oldriver.html (1657 words)

	Old River Control Structure - Wikipedia, the free encyclopedia
		The Old River Control Structure was built by the U.S. Army Corps of Engineers at the divergence of the Mississippi and Atchafalaya Rivers in order to maintain the water distribution between the two at 70% and 30% respectively.
		This was done in response to the increasing amounts of water from the Mississippi that was flowing into the Atchafalaya due to its steeper course to the Gulf of Mexico.
		The details of the Old River Control system are explored in the "Atchafalaya" section of the book "The Control of Nature" by John McPhee.
	en.wikipedia.org /wiki/Old_River_Control_Structure (170 words)

	The Old River Control Structure on the Lower Mississippi River (Site not responding. Last check: 2007-10-11)
		The configuration is roughly in the form of an H in which the the Atchafalaya-Red Rivers form the left leg and the Mississippi the other with the Old River being the cross branch.
		The Old River Control Project of the Corp of Engineers is working to prevent the capture of 100 percent of the Mississippi by the Atchafalaya.
		The Red River had been a direct tributary of the Mississippi for two millenia, but due to the clearing of the Atchafalaya it was captured by the Atchafalaya in the 1940s.
	www.sjsu.edu /faculty/watkins/oldriver.htm (569 words)

	Old River Control Structure, Point Breeze, LA
		The river channel is less than 1500 feet from the Low Sill Structure, the closest it will come to any of the structures in the Old River complex.
		Above is the input channel to the Old River Auxiliary Structure that carries water from the Mississippi River to the dam.
		Above is the Old River Lock, which allows small tows to move between the Mississippi River to the east and the Red and Atchafalaya Rivers to the west.
	www.visi.com /~jweeks/lower_mississippi/pages/lmiss23.html (2263 words)

	The Why Files \| 2. Can it be controlled?
		The "Old River Control Structure," part of that effort, is a gargantuan hunk of concrete that is supposed to prevent the Mississippi from doing what comes naturally -- shortcutting down the Atchafalaya River to the Gulf of Mexico.
		During the flood of 1973, the control structure was severely undermined by the floodwaters.
		From the control structure and the colorful Cajuns who run it, McPhee works effortlessly outward to the larger picture of environmental change at the mouth of the Mississippi.
	whyfiles.org /229bk_review/index.php?g=2.txt (754 words)

	Old River Control Structure
		The Old River Control Structure is composed of this billion dollar series of locks and dams located at a point along the Mississippi River, which prevent the river from diverting into the Atchafalaya River.
		The natural meandering patterns of the Mississippi encourage the course of flow to veer into the Old River, and then into the Atchafalaya, which would flood the Atchafalaya basin, and leave cities and industries from Baton Rouge to New Orleans, high and dry.
		The battery of two mechanical flow control structures and earthen dams prevents this from occurring, though there has had to be a continued addition of structures in order to do so, testing the creative skills of the Army Corps of Engineers, the agency that controls the entire Mississippi River channel.
	ludb.clui.org /ex/i/LA3126 (153 words)

	The Old River Control Structure on the Lower Mississippi River (Site not responding. Last check: 2007-10-11)
		The configuration is roughly in the form of an H in which the the Atchafalaya-Red Rivers form the left leg and the Mississippi the other with the Old River being the cross branch.
		The Old River Control Project of the Corp of Engineers is working to prevent the capture of 100 percent of the Mississippi by the Atchafalaya.
		The Red River had been a direct tributary of the Mississippi for two millenia, but due to the clearing of the Atchafalaya it was captured by the Atchafalaya in the 1940s.
	www2.sjsu.edu /faculty/watkins/oldriver.htm (569 words)

	The Mississippi Levee System and the Old River Control Structure
		Old River was formed when Captain Henry Shreve dug a shortcut across the the neck of Turnbull’s Bend in 1831.
		They did so by building the Old River Flood Control Structure which consisted of massive floodgates that could be opened and closed as needed at the entrance to the Old River.
		With the help of diversion structures, the wetlands of the Mississippi River Basin may be able to offset the effects of subsidence and coastal erosion.
	www.tulane.edu /~bfleury/envirobio/enviroweb/FloodControl.htm (1937 words)

	BTNEP - Trip #20
		The structures prevent the capture of the Mississippi River by the Atchafalaya River.
		The purpose of the spillway is to control flooding on the Mississippi River by diverting water into the Morganza Floodway and the Atchafalaya Basin.
		Using a Louisiana state map, identify the location of the control structure and discuss the importance of its proximity to the Atchafalaya Basin and thalaya Basin and the Barataria-Terrebonne Esstuary.
	www.btnep.org /minis/fieldtrip/trip20.htm (893 words)

	The New Yorker: From the Archives (Site not responding. Last check: 2007-10-11)
		In perpetuity, at Old River, thirty per cent of the latitude flow was to pass to the Atchafalaya.
		Old River, 1973, was merely the most emblematic place and moment where, in the course of three centuries, failure had occurred.
		River stages, in their wide variations, became generally higher through time, as the water was presented with fewer outlets.
	www.newyorker.com /archive/content/?050912fr_archive01 (18563 words)

	January 6, 2006 - FYI - The University of Texas at Dallas
		The final switching of most of the water and sediment from the old to the new channel may be triggered by a major flood that scours and widens the new channel.
		During the 1973 flood on the Mississippi, the torrent of water scoured the channel and damaged the foundation of the Old River Control Structure.
		The widths of the rivers in the diagram are proportional to the estimated (1700) or measured (1980–1990) suspended sediment loads (in millions of metric tons per year).
	www.utdallas.edu /research/fyi/060106/commentary.html (4249 words)

	Blogcritics.org: Katrina could alter Louisiana geography, Mississippi river flow
		The Old River Control structure was built by the Army Corps of Engineers to prevent the Mississippi drainage from switching to the steeper Atchafalaya channel.
		Old River Control and much of the current levee system did not exist at the time of the devastating flood of 1927.
		In addition, the problem of river capture is exacerbated by the difference in altitude between the river bed where it is (constrained in the Mississippi Channel by the constant maintainance by the Army Corp of Engineers), and where it wants to be, down the Atchafalaya River and out to the Gulf, forming a new delta.
	blogcritics.org /archives/2005/08/29/005318.php (10878 words)

	Center for Environmental Communications
		The decision was made to control the river so that year-round 70% of latitude flow would proceed down the Mississippi River and 30% down the Atchafalaya.
		The Atchafalaya would be a rushing, raging river, even during the fall for a period of time until it scoured the channel and filled in the lower reaches so that the flow would diminish.
		Morganza Control Structure: After the Bonnet Carré Flood Control Structure is opened, and if the river continues to rise to the next critical stage, this structure is opened.
	www.loyno.edu /lucec/mrdcontrol.html (2192 words)

	The Mississippi Levee System [Attempts to keep the river from abandoning NOLA]
		As I recall from Louisiana history class, the Atachafalya is a distributary of the Mississippi river, meaning that it flows out of the Mississippi, not into it.
		The levee system that has been built along the river, coupled with the canal system to keep the interior of the city dry, prevent the land from being replenished by the annual spring floods.
		Then, build a canal and an inland dredged port parallel to the Atchafalaya, and control structure to keep enough water coming down the existing channel for the canal, along with locks between the canal and the existing channel.
	www.freerepublic.com /focus/f-news/1480371/posts (3142 words)

	Welcome To Rohtas
		Every part of its structure has been carried out in broad and simple manner, each line and plane has a sober and massive elegance, while the whole is aesthetically competent.Within the fort a small town has developed and several thousand people live here.
		In the old days the G.T. Road used to pass by the Rohtas Fort but it was shifted during the British period to its present position and now it passes through Deena.
		But the Afghan Jagirdar was not able to exercise full control over this subject since the allegiance of the people was very lose and the landlords were particularly independent.
	rohtas.biharzoom.org (1807 words)

	EO Newsroom: New Images - Mississippi Meanders
		Floods occasionally spread across the wide, shallow valley that flanks the river, and new channels are left behind when the water recedes.
		The modern river course is superimposed on channels from 1880 (green), 1820 (red), and 1765 (blue).
		In the 1950s, engineers noticed that the river’s present channel was on the verge of shifting westward to the Atchafalaya River, which would have become the new route to the Gulf.
	earthobservatory.nasa.gov /Newsroom/NewImages/images.php3?img_id=17383 (357 words)

	Mississippi, river, United States: The Mississippi Delta
		After receiving the Arkansas and Red rivers, the Mississippi enters a birdsfoot-type delta, which was built outward by sediment carried by the main stream since c.
		Indications that the Mississippi River might abandon this course and divert through the Atchafalaya River led to the construction of a series of dams, locks, and canals by the U.S. Army Corps of Engineers.
		Known as the Old River Control Structure, it was undertaken to prevent such an occurrence.
	www.factmonster.com /ce6/us/A0859679.html (255 words)

	Ayutthaya Thailand Ayutthaya guide Thailand Ayutthaya
		Such was the ferocity of battle at the time that the King's consort, Somdet Phra Suriothai who fought on behalf of her king and people perished in battle however her efforts spurred the Siamese army on to defeat the Burmese invaders and expel them from the country.
		She became the first Thai heroine and a gold covered chedi in memorial to her is located in the west of the old city.
		The Burmese intended to destroy everything precious to Thais however their control was only short liyed as within a few years the.very determined General Taksin finally expelled them from Thai soil for the last time and reunited the country once again.
	www.bangkok-hotels-bangkok.com /ayutthaya (645 words)

	Petition to Delist Priority Organics from the Mississippi River Assessments
		These subsegments are, Mississippi River from Old River Control Structure to Monte Sano Bayou, (Louisiana subsegment 070201) and Mississippi River from Monte Sano Bayou to Head of Passes (Louisiana subsegment 070301).
		Starting at the Arkansas border these are: 070101-Mississippi River from Arkansas border to Old River Control Structure; 070201-Mississippi River from Old River Control Structure to Monte Sano Bayou; 070301-Mississippi River from Monte Sano Bayou to Head of Passes; and 070401-Mississippi River from Head of Passes to Mouth of Passes.
		However, this exceedance is not relevant to impairment because the subsegment is not designated for drinking water use, the aquatic life use was not compromised and the exceedance was not detected in any downstream subsegment.
	www.deq.louisiana.gov /portal/Default.aspx?tabid=1561 (1836 words)

	GeoDataSource World Structural Features Database Gold Edition
		Database of worldwide man-made structural features in text format suitable for any applications requiring a comprehensive list of structures and related information such as regions.
		A structure erected to break the force of waves at the entrance to a harbor or port
		A massive structure of masonry or large stones serving as a pier or breakwater
	www.geodatasource.com /structural-gold.html (2563 words)

	Berwick Bay Vessel Traffic Service (Site not responding. Last check: 2007-10-11)
		During high river stages, floods, or other emergencies, the District Commander may prescribe by navigation bulletins or other means the limiting speed in land miles per hour deemed necessary for the public safety for the entire section or any part of the waterways covered by this paragraph, and such limiting speed shall be strictly observed.
		The waters of the Cuyahoga River and the Old River extending ten feet into the river at the following eleven locations, including the adjacent shorelines, are safety zones, coordinates for which are based on NAD 83.
		All waters and adjacent shoreline east of Pere Marquette Park, Milwaukee River encompassed by the arc of a circle with a 210-foot radius of the fireworks barge in approximate position 43°02.33&min; N, 087°54.46&min; W (NAD 1983).
	www.uscg.mil /d8/vts/berwickbay/33CFR165.html (14662 words)

	La DNR News Release (Site not responding. Last check: 2007-10-11)
		The Old River Control Structure usually diverts 30 percent of the water from the Mississippi River down the Atchafalaya River but 32 percent may be the magic number to help boost the state's crawfish crop this season.
		According to Corps officials, the river stage at Butte LaRose is above 9 ft. and the forecast condition for the Red River Basin is normal precipitation.
		Additionally, officials say that the National Weather Service forecast for spring flooding in the lower Mississippi valley is "above average." The Corps, since 1950, has operated the Old River control structure at a 70 percent Mississippi River, 30 percent Atchafalaya River distribution.
	dnr.louisiana.gov /sec/execdiv/pubinfo/newsr/archive/crawfish.ssi (376 words)

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	www.forester.net (48 words)

	[No title]
		Questions for discussion in your paper: Why is it difficult for engineers to design a "dam" like the Old River Control Structure in southern Louisiana so that they can be certain that it will prevent avulsion of the Mississippi into the Atchafalaya?
		In a relative sense, what was the magnitude and expected frequency of the flood of 1973 that caused much damage to the Old River Control Structure?
		Consider both human and natural influences.) What are the demands placed on the Corps of Engineers and other river management agencies in the Mississippi delta region by various commercial interests?
	epswww.unm.edu /coursinf/envsci102l/Atchafalaya.doc (238 words)

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