Advertisement

Archive for Sunday, November 11, 2007

Bowersock Dam’s future as murky as muddy Kaw

Engineering report raises concerns about integrity of 1870s structure

Brian Farley, plant manager for the Bowersock Power Co., looks out at the Kansas River as it flows over the Bowersock Dam on Thursday. Inspections of the dam, which was built in the 1870s, are done mostly by feel because the river is so muddy. But city leaders would like to get a good look at it now because a new report by a city-hired engineering firm says there is reason to be concerned about the dam's future.

Brian Farley, plant manager for the Bowersock Power Co., looks out at the Kansas River as it flows over the Bowersock Dam on Thursday. Inspections of the dam, which was built in the 1870s, are done mostly by feel because the river is so muddy. But city leaders would like to get a good look at it now because a new report by a city-hired engineering firm says there is reason to be concerned about the dam's future.

November 11, 2007

Advertisement

City leaders ponder Bowerstock Dam's future

It may be Lawrence's oldest piece of infrastructure, but now the Kansas River's Bowerstock Dam, built in 1874, is getting a fresh look. Enlarge video

No one has actually seen the Bowersock Dam for more than 30 years now.

Sure, thousands of motorists a day can get a peek at the structure as they drive across the twin Kansas River bridges near Massachusetts Street. They can see the constant white fury of foam, and notice how the dam divides the river into peace and chaos. They can see the "flash boards," the jagged pieces of lumber atop the dam that look like a broken-down 19th century ballpark fence.

But what isn't seen is the muscle. The face of the dam that obviously lies below the water and is responsible for keeping the Kaw contained. Not even the divers who are hired by the city to periodically inspect it and do maintenance have really seen it well.

"They mainly are just going by feel," said Philip Ciesielski, the assistant director of the city's Utilities Department, which is responsible for maintaining the dam. "It is too muddy and murky to really see."

The last time anyone had a good look at the dam was when the Kansas River bridges were being built - and the water levels were low - in the late 1970s.

City leaders, though, sure would like to get a good look at it now. That's because a new report by a city-hired engineering firm says there is reason to be concerned about the dam's future.

"Based upon the visual observations made alone it is not possible to determine if the dam is in immediate danger of failing, as significant structural concerns exist," engineers with Black & Veatch Engineering wrote.

1870s technology

This much is known about the Bowersock Dam: it is one of the older pieces of infrastructure in the city. It was built in 1874 by an entrepreneurial engineer named Orlando Darling. The major undertaking came as a result of the city largely running out of easily accessible wood to burn for steam power. And attempts to locate coal beneath the Lawrence landscape were unsuccessful.

But at City Hall there's a very here-and-now reason that leaders care about Bowersock. The dam is an absolute linchpin in the city's water system.

Without the dam, the city's Kaw Water Treatment Plant - just upstream of the dam - would have a very difficult time capturing enough water to treat to meet the city's needs. The dam raises the river's water elevation by about 10 to 15 feet, Ciesielski said. Without the dam, the stretch of river near the water plant would look much like the river does downstream of the dam - a hodgepodge of rock islands and sandbars.

In short, the city's drinking water system relies heavily on 1870s technology.

Dam costs

The technology is still working for the city, but it may require large amounts of new funding in the future to keep it working. That was the general conclusion from the recent Black & Veatch report.

The report broke down the needed repairs into short-term and long-term categories. The short-term work - which really needs to be done this winter when water levels are lower - amounts to at least $320,000.

That's within the city's means. Ciesielski said the city's utility department has budgeted $1.1 million for dam maintenance in 2007. The budget also includes $1.4 million for a significant maintenance project in 2013. Both projects would be paid for through existing water rates.

But engineers aren't certain that the short-term fixes will do much to fix the dam's problems. If not, then the long-term costs become expensive and outside of what the city has budgeted.

The engineers estimate long-term costs could range from $7.5 million to about $18 million, depending on how much work is needed. Before that work is done, the engineers recommend that the city study building a new dam, which has a rough cost estimate of $20 million to $25 million.

Ciesielski said the city is taking that recommendation to heart.

"Our next step after this maintenance project is to determine whether there is another maintenance cycle left in the dam or whether there needs to be a replacement of the dam."

Ciesielski said that decision ideally should come before 2013 when the next major maintenance project is budgeted to occur.

Old-fashioned building

Ciesielski said city engineers will be watching the dam closely following the repairs for evidence that the short-term fixes are working.

Even the watching won't be easy. Basically, the city will be looking for small signs - like whirlpools in the water - to determine whether water is flowing through the dam instead of being routed through the spillways and designated outlets.

Everything about the dam is complicated by the fact that it was built so long ago and very little is understood about how it was built.

"What we know is that it is just a mass of materials held in place by its own weight," Ciesielski said. "But there aren't a lot of drawings to go by."

Engineers do know that inside the dam, cage-like structures hold boulders, rubble and other heavy objects that were available in 1870s Lawrence. The cages largely were built with wire mesh and timbers.

That's right, a portion of the dam is built out of wood.

That's part of the concern with the dam. Wood, Ciesielski explained, is a decent enough material as long as it always remains dry or always remains wet. When it starts alternating back and forth between the two conditions, it becomes a problem.

In some places on the dam, that is what is happening. The engineers noted that some timbers that were exposed in 2004 have now "eroded completely." The problem is complicated because water is leaking through the dam. In the past, crews have put bags of grout along the face of the dam to stop the leaking, but engineers have said that isn't a permanent fix.

The report expresses concerns that if the timbers begin to give way, it would "compromise the integrity of the structure."

On the river

Sarah Hill-Nelson spends more time than most thinking about the Bowersock Dam. Her great-great-grandfather - J.D. Bowersock - was the entrepreneur credited with making repairs and improvements to the dam in the late 1870s. The town was so pleased with his work and the power the dam provided to a growing hub of industry that citizens labeled him "Master of the Kaw."

Hill-Nelson spends many of her workdays right alongside the Bowersock Dam, in the same spot J.D. Bowersock ruled. She's an owner/operator of the Bowersock Power Co., the small red brick building behind City Hall. It contains turn-of-the-century hydroelectric turbines that crank out electricity that is sold to Westar Energy and is marketed to consumers wanting to buy "green energy."

Hill-Nelson is glad that city leaders are poised to take a serious look at the dam's future. She thinks the city - with help from her crews - has done a good job of keeping the dam in working order. She doesn't think the dam - which isn't a flood-control dam - is in any real danger of immediately giving way. But she doesn't want it to get to that point either.

"Without the dam, Lawrence would be in trouble," Hill-Nelson said. "If something were to happen to the dam, it could be really, really costly after the fact."

She has mixed emotions about the talk of abandoning the historical dam and building a new one. If the city got serious about that idea, Hill-Nelson said her company likely would get serious about exploring the feasibility of building an additional hydroelectric power plant on the north side of the river.

But Hill-Nelson said she does enjoy marveling at her family's work, of how teams of oxen hauled large boulders from Jefferson County to build the dam.

"I think a lot about how it was such a huge endeavor," Hill-Nelson said. "And it marked a time when the community was thinking so big. They were building the dam because Lawrence had aspirations to be the dominant industrial center of the plains.

"For me, it is endlessly fascinating."

Comments

7 years ago

Oh for Pete's sake! This city is a freakin' disaster. Let's just pack it in, folks. Shows over. We had a good run but let's stop kidding ourselves.

trollkiller 7 years ago

Bowersock has managed to generate a profit and avoid bankruptcy for over a hundred years; I imagine some might be envious of that, huh?

KS 7 years ago

That dam is a more important part of Lawrene than a new library. If you have a visitor come to town, which would you show off to them. The old dam or the old library?

toefungus 7 years ago

Oh, great, another reason for my water bill to go up. Pretty soon, I will just drive to Topeka for water. Even with the gas, it will be cheaper.

FormerCentralKansan 7 years ago

I vote for routing the "North Leg" of South Lawrence Trafficway right on top of the dam. Let's see if it takes 20 years for it to be built.

gccs14r 7 years ago

Couldn't we have found an engineering firm that's not in bed with Halliburton?

Richard Heckler 7 years ago

Bring on new hydroelectric technology and generate Lawrence electricity from the dam thus no more coal fired emissioms and more "green coller" jobs for Lawrence. It's time to take this step. Instead of credits bring on new hydroelectric power.

Keith 7 years ago

I just love the way the Hill family gets to take the day to day money off the dam, while we are always on the hook for the expensive repairs due to the fact that our water supply is held hostage.

Flap Doodle 7 years ago

"Marion (Marion Lynn) says: We could blow the dam????!!!!!!!!!!!!!!!!!!!"

(insert rude suggestion for outingbulkerbiz)

Flap Doodle 7 years ago

I think merrill meant "collard greens".

hipper_than_hip 7 years ago

"gccs14r (Anonymous) says:

Couldn't we have found an engineering firm that's not in bed with Halliburton?"

Source please.

blessed3x 7 years ago

I, think, someone, needs, to, blow, up, northtown's, "comma", key. It's, too, early, in, the, morning, for, so, much, punctuation.

pomegranate 7 years ago

I've come to realize that the people on the north are just less educated. The word damN is the bad 4-letter word. The word dam is the water restricting barrier across the river.

Ragingbear 7 years ago

The Kaw isn't near big enough for hydro power to produce anything of significance.

Anyone else notice how the picture shows somebody violating the Lawrence smoking ban? Does that rule somehow not apply to city workers?

salad 7 years ago

"The Bowersock dam is one of the reasons that the Kaw is so polluted as it restricts water flow."

How do you figure? I fail to see how water flow has anything to do with pollution content. Fact is, pollution in the Kaw is due almost entirely to agricultural run-off; both cow-made and man-made (chemicals). The dam will stay regardless. It's too expensive to remove plus it makes money.

Toto_the_great 7 years ago

Create a side channel for the City for water supply and blow the dam. Follow the progressive states and start taking out dams. Kansas ranks second in the nation in the number of dams. The hydroelectricity is great, but in the grand scheme of things, the dam causes more problems than it solves. Heck, move the hydro station to Clinton. All of the pollution from upstream (e.g., Topeka) settles out behind the dam and that is why we see fish advisories in Lawrence. If you take out the dam, the pollution becomes KC's problem.

One would expect to see a better fishery in the Kaw if the dam is removed. It would create more fishin' holes for catfish (the only problem is the fish no longer would be piled up at the base of the dam... so it gives the fish a better chance of not being caught). The exotic Asian carp are already upstream so no need to worry about prohibiting their movement.

Many cities in Wisconsin were opposed to dam removal but once they did it, they loved it. They had more parks and a new water from district. Other cities in other states also have positive attitudes about dam removal. L-town would fit right into this pattern.

A downside of removing the dam would be taking away the crew team's practice area. I suppose Potter's Lake is too small?

pomegranate 7 years ago

Hey, Northtown, don't get your panties all in a wad! I never said I didn't agree with a lot of what you said. I would just like you to be more cognizant of what you are saying, maybe proofread a little. By the way, I surely am not anything near perfect, and how did you know I have a fat litle butinsky?

50YearResident 7 years ago

I seem to remember that the dam was constructed solely for the power company with a 100 year lease with a clause that the power company had to maintain the dam! Now the city appears to have taken over that responsibility because the water intake pipe is located in the reservoir created by the dam. Bowersock has done minimal repairs because they know the city of Lawrence will insure the dam stays intact because of the water pipe. Now when the dam requires millions of dollars to maintain the power company (Bowersock) claims the city is benefiting from the (green) power and the city should spend the money.

Correct me if I am wrong, I just want the expense to go to the right place.

pomegranate 7 years ago

North I do not know you, or anyone else, and no one knows me. I am truly anonymous. I am getting the jist of how things work here, finally. I just hope the commissioners read these comments, because they would find out the true thinking of this town.
Just wondering, though-6'6", 180 lbs, retired at age 46, if you are a he or she! I have not seen anyone, he or she, that tall and slim in my neighborhood.

salad 7 years ago

Northtown, take a deep breath and try to relax before that vein popping out on your forehead busts. BTW, you're seriously 6'6" and 180lb! That's like cancer-patient thin!!! Man dude, you must look like a match-stick with legs! Must be a runner.

Bladerunner 7 years ago

KS (Anonymous) says:

That dam is a more important part of Lawrene than a new library. If you have a visitor come to town, which would you show off to them. The old dam or the old library?

Um...Neither. I would take them to the Sandbar.

Godot 7 years ago

This might be a good time for the State to make its report about the condition of the levees, and whether or not they will be recertified. May as well put all cards on the table.

shockchalk 7 years ago

He doesn't work for the city and he's outside in a private, not public, area so no, he's not violating any law by smoking outside ragingbore.

bd 7 years ago

The city has also purchased ALL of the availible water rights left in Clinton. I would not be supprised if they dont end up with the farmland ind. water rights and wells! The dam should be Bowerstock's problem!

pomegranate 7 years ago

Dear Reality, You need to get out of Lawrence, and or Kansas and see something of the rest of the USA. Look up "spawning salmon" and see just how those gutsy fish maim and batter, and kill themselves just to spawn. And they do swim upstream to do this. It is an amazing sight.

toefungus 7 years ago

The power company should pay a sizable franchise fee each month to Lawrence over the estimated life of the rebuild dam. If the power company gets to generate power and the taxpayers have to pay for the dam, I am going to be pretty unhappy.

toefungus 7 years ago

Oh, and rename it the "Rock Chalk" Dam.

salad_daze 7 years ago

REMOVE THE CITY OF LAWRENCE AND RESTORE THE BANKS OF THE KAW WITH THE INDIANS WHO ONCE CALLED THE RIVER HOME!

KsTwister 7 years ago

I don't think counting on the Kaw for electricity (especially in August) would become very cost effective,however, many businesses have already proven you can sell our City Hall just about anything---whether they need it or not.

Commenting has been disabled for this item.