Charting a Course for the ‘Big Muddy’

  • A recent National Academy of Sciences report on the Missouri River suggested some of the river's natural meanders and access to the flood plain be restored. It also suggested sections of the river be reviewed to see if barge traffic might be closed for parts of the year or permanently.

The National Academy of Sciences has issued a report that calls for the restoration of the longest river in the United States. That report says the government needs to stop studying problems along the Missouri River and – with the help of residents – do something about them. The Great Lakes Radio Consortium’s Lester Graham has the story:

Transcript

The National Academy of Sciences has issued a report that calls for the restoration of the longest river in the United States. That report says the government needs to stop studying problems along the Missouri River and – with the help of residents – do something about them. The Great Lakes Radio Consortium’s Lester Graham reports:

On the opposite bank from here, you can see the Big Muddy empty into the Mississippi River. I’m standing on the spot where Lewis and Clark and the Corps of Discovery spent the winter before starting their historic expedition up the Missouri, across the Rockies and to the Pacific coast. If Lewis and Clark could see the Missouri today, there’s little that they’d recognize at this end of the river. Over the years it’s been straightened, walled-in by levees and channelized. Its braided river system of meanders, backwaters and eddies, once alive with wildlife are – for the most part – gone.

Seventy years ago as the government began huge civil engineering projects; it expected the Missouri River to be a major transportation means of getting grain from the farm fields of Nebraska, Kansas, Iowa and Missouri to the markets. But as it’s turned out, almost all of the grain from those states is moved to market by truck or rail or in Missouri’s case on the Mississippi River. Only a tiny fraction less than one-half of one-percent of all the grain harvested in those states is moved by barge on the Missouri River.

According to the Army Corps of Engineers, barge traffic on the Missouri benefits the economy by saving about seven million dollars in transportation costs. But some years the Army Corps of Engineers spends that much maintaining the lower Missouri as a navigable river, and the taxpayers foot the bill.

The National Academy of Sciences – the NAS – was instructed to study the Missouri River and determine the best uses of the river and its flood plain. Stephen Gloss was the chair of the committee that wrote the final report. He says one thing’s certain; the condition of the Missouri River has been studied to death. Its problems are well documented.

“The people should understand the Missouri River ecosystem is in a significant state of decline. There’s been a lot of degradation of the ecological properties of the system. There’s ample scientific evidence to credibly demonstrate that and there doesn’t need to be any more research done to make that credible. The most important thing is to undertake some immediate action.”

The NAS report suggested that the people of the states along the Missouri River should start figuring out where some of the Missouri’s meanders could be replaced and where it could be allowed back into its old flood plain.

At a town hall meeting in Columbia, Missouri, three of the authors of the study, including Stephen Gloss, met recently with representatives of the barge industry, agriculture and government agencies along the Missouri River and with the public. A farmer from Oregon, Missouri, Lanny Meng, told the NAS committee members he’s heard this kind of talk for several years, and he didn’t much like it.

“When they talk about meanders of the Missouri channel and they talk about connectivity with the flood plain. And that flood plain’s my cornfield.”

“Well, I think that the flow change and the management change of the Missouri River’s gonna have a drastic negative affect on my farming practice, and my neighbor’s farming practice and my county. Things will change badly for our community?”

The farmers are not the only ones concerned about change on the Missouri River. The barge industry, which depends on keeping the water level artificially high and the channel deep doesn’t believe there’s enough water to keep the reservoirs full in the upper Missouri, make new diversions for wildlife backwaters and meanders, and keep the barges floating.

Chris Bescia is with the barge industry group Midwest Area River Coalition 2000, better known as MARC-2000.

“So, when the National Academy of Science report says that we want to have more cuts and alluvial deviations in the river, when they say that we want to re-connect the flood plain, when they say all these things, that’s essentially taking out the channel training structures that are designed to maintain a nine foot channel.”

Which the barges need to push their cargo up and down stream.

The NAS report indicates that the people along the river and the state and federal agencies that have authority can find a balance between the commercial and agricultural interests and that of those who want better hunting, fishing, or simply better habitat for the sake of the wildlife and the natural beauty.

Chad Smith is with the environmental group American Rivers. He says it will take some compromises, but it can be done.

“The Missouri is not even close to living up to its potential. And we’re missing out on a lot of quality of life benefits, but also on a lot of economic benefits by managing this river as a ditch and not as a river.”

Smith stresses that no one is calling for the end of barge traffic on the Missouri, or wants the end of farming in the flood plain. But Smith says there’s been just a little too much development of the river, and we need to restore parts of it here and there.

The chief author of the National Academy of Sciences report, Steven Gloss, says that work needs to begin quickly because it will take a very long time to fix the Missouri River’s problems.

“We’ve been at this for a long time, a hundred years or better and, you know, it’s gonna take several decades to get it back a little bit in the other direction. I think we really need to look at this as a long-term sustained process. It’s not something we can find a solution for in five years and walk away from it. We need to be at this for the rest of our lives and for future generations.”

But Gloss stresses this cannot be a job for the government alone. The NAS report says the Missouri can only find balance between the competing interests if the people along the Missouri River all have a seat at the table and share in the river’s wealth.

For the Great Lakes Radio Consortium, this is Lester Graham.

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Dams Make Major Floods Worse?

  • The Army Corps of Engineers installed these wing dams to force the current to the middle. The rushing water scours the bottom of the channel to keep navigation open. A new study alleges the wing dams slow the current during major floods and cause flood waters to be higher. Photo by Lester Graham.

A recent study concludes that some actions of the Army Corps of Engineers might be causing more, rather than less damage during major floods on rivers in the Midwest. The study by two Washington University professors found that wing dams, which jut out into the river, could cause big floods to rise even higher. The Great Lakes Radio Consortium’s Lester Graham takes a closer look at this study:

Transcript

A recent study concludes that some actions of the Army Corps of Engineers might be causing more, rather than less damage during major floods on rivers in the Midwest. The study by two Washington University professors found that wing dams which jut out into the river could cause big floods to rise even higher. The Great Lakes Radio Consortium’s Lester Graham takes a closer look at this study:

The Mississippi and the Missouri rivers are two of the major arteries for barge transportation in America. Millions of tons of grain, and raw materials are floated up and down the rivers each year. It’s the Army Corps of Engineers’ job to keep the rivers open to barge traffic. The Corps has been doing that job for the past 150 years. But since the 1930’s that effort has taken on immense proportions. Huge dams hold back the river, keeping the water high enough for the barges to travel up and down-stream. Big earthen dikes, called levees, wall in the rivers, keeping them from flooding farms and towns, but also keeping the water from reaching the natural flood plain. Robert Criss and Everett Shock studied flood levels and the effects of the Corps of Engineers projects. Criss says those dams and levees alone might be enough to disrupt the flow of the river and cause flood stages to be higher.

“But the other component is these structures called wing-dams which are jetties of rocks that project out perpendicularly into the channel. For high-flow conditions, these act something like scale in a pipe. They impede the flow, restricting the channel. That slows the velocity of the water down and that also makes the flood stages higher.”

The purpose of wing dams is to force the current to the middle of the river to scour out the navigation channel to keep it open for the barges. Researcher Everett Shock.

“So, they do the job they’re intended to do. It seems that there’s an unintended–perhaps unintended consequence of all these constructions along the river that shows up when we have a big flood and makes it to –on the basis of our study– makes these big floods worse.”

Criss and Shock say their study finds that since these flood control projects have been erected, there have been more big floods, such as the one in 1993 that flooded the Mississippi and some of its tributaries for most of the summer. Robert Criss.

“The fact is, before World War II, a flood stage of 38-feet is very rare and now it happens every five years.”

But not everyone agrees with the methodology used by the researchers. The
Corps of Engineers dismisses the researchers’ study, saying they used flawed data. Corps officials point to a study at the University of Missouri – Rolla. That study compared the 19th century method of measuring a river’s flow by timing how fast floats moved in the current to the methods used today. Dave Busse is a scientist with the Army Corps of Engineers. He says the original stream flow measurements –the ones Criss and Shock used— were inaccurate.

“The flows were over-estimated by 30-percent using this float measurements rather than the measurements than we use today.”

Criss and Shock are skeptical of new numbers that the Corps prefers. Saying it seems awfully convenient for the Corps because changing the numbers makes the historic floods look smaller and therefore makes the 1993 flood look unprecedented. Criss and Shock say based on the original records, there was as much water in past floods as in the 1993 flood but lower water levels. Criss and Shock say the difference between then and now is that the Corps’ big dams, levees, and wing dams constrict the river’s flow and make floods higher.

The Corps, however, has other criticisms of the Criss and Shock study. Dave Busse says the researchers ignored the role of the Corps’ reservoirs in the rivers’ watersheds. Busse says the reservoirs hold back water that would otherwise be part of a flood. And Busse says, another flaw is the researchers conclusions about wing dams. The Corps says the wing dams force water to deepen the channel and increases the flow of the river.

“So, what we have is the same –it’s a re-shaped river, but its carrying capacity is actually higher now. We can actually carry more water at the same stage. The river got deeper, therefore this conclusion that they’ve made is wrong.”

The Corps says there’s more to managing the river than the researchers have considered. Criss and Schock, meanwhile, say their study is not the first to be dismissed by the Corps of Engineers. They say other studies have found similar results, but the Corps dismissed them as well.

Environmentalists have been arguing for decades that levees and dams keep floodwaters from spreading out on their natural flood plains and cause higher flood levels. The Criss and Shock study adds to their arsenal of arguments to change the way the rivers are managed. But most environmentalists concede that we’ve become somewhat dependent on the Corps flood control projects. Chad Smith is with the environmental group,
American Rivers.

“In most ways both of these camps are right. The Corps is right that putting some of the structure in has helped to reduce the kind of annual flood events that always happen on a big river like this, but what they unfortunately have done is to exacerbate what happens when you have bigger floods and the wing dams and the levees and the dams themselves all are part of that.”

The Army Corps of Engineers says it’s reviewing its way of managing rivers in light of the 1993 flood. But they also note that while flood stages might be higher more often than they were in the 19th century, most of the time those floodwaters remain behind the floodwalls and levees, protecting the communities from high water, and the Corps says in the end, that’s the only fact that really matters.

DAMS MAKE MAJOR FLOODS WORSE? (Short)

  • The Army Corps of Engineers installed these wing dams to force the current to the middle. The rushing water scours the bottom of the channel to keep navigation open. A new study alleges the wing dams slow the current during major floods and cause flood waters to be higher. Photo by Lester Graham.

A recent study concludes that some of the flood control projects along the Midwest’s largest rivers might be making the severity of some floods worse. The Great Lakes Radio Consortium’s Lester Graham reports:

Transcript

A recent study concludes that some of the flood control projects along the Midwest’s largest rivers might be making the severity of some floods worse. The Great Lakes Radio Consortium’s Lester Graham reports:

The study, published in the journal Geology, looked at the history of flood stages and river flows along portions of the Mississippi and Missouri rivers. It concludes that the dams, dikes, and levees constrict rivers so that when there are massive floods, such as on the Mississippi in 1993, they make the situation worse. Everett Shock is a professor at Washington University and one of the authors of the study.

“There needs to be some very clever thought on how to go about some differences in management practices so that we aren’t making large floods worse.”

The Army Corps of Engineers, which built and maintains the flood control projects along rivers, says the study is flawed because it doesn’t use updated data and it doesn’t consider the role that man-made reservoirs play in holding backwater during floods. The Corps also notes that before the flood projects, the rivers often damaged homes, businesses and property on a large scale, something that the Corps says rarely happens now.