PaintSquare.com
Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site

 

Advertisement

PaintSquare


Coatings Industry News

Main News Page


65-Foot Crack Found in WA Dam

Tuesday, March 4, 2014

Comment | More

Federal, county and independent engineers have teamed up on an emergency response to safeguard the Wanapum Dam in Washington State after divers discovered a two-inch-wide, 65-foot-long crack in a spillway pier.

Water levels in the Wanapum Reservoir on the Columbia River were drawn down 20 feet by Monday (March 3) to reduce pressure on the spillway, officials said.

Wanapum Dam
Photos: Grant County PUD

A spokesman called the problem serious but said it "posed no immediate threat."

The level was reduced six feet last week and an additional 14 week over the weekend.

'Serious' But 'No Immediate Threat'

A team of engineers and Federal Energy Regulatory Commission personnel has been constantly monitoring and evaluating the structure, and officials have warned downstream towns and government agencies about the damage.

All boat launches on the Wanapum Reservoir and the Priest Rapids Reservoirs downstream have been closed.

“At this point, we already know there’s a serious problem,” Grant County Public Utility District spokesman Thomas Stredwick told reporters last week. However, he added, "there's no immediate threat to public safety."

'Bowing' Seen

Divers discovered the structural damage Thursday (Feb. 27) along the base of one of the spillway piers after an engineer noticed a “bowing” in the roadway above the dam, Stredwick said.

Inspectors later discovered that the 820-foot-long spillway was raised 2.5 inches above the water.

Wanapum Dam

The crack in a spillway pier was found after an engineer noticed “bowing” in the roadway above the dam. Later readings found movement in the structure.

"Survey readings taken earlier this week showed that the area has moved outside of historical norms," Stredwick said in a statement Thursday.

Subsequent readings showed no additional movement, he added.

The drawdrawn was ordered "to reduce the pressure on the spillway while inspectors investigate," Stredwick said.

Spillway Set-up

Spillways allow the water to “spill” past the dam, rather than running through the turbines. The spillway consists of multiple, independent structural sections that support the spillway gates.

Each of Wanapum Dam’s 12 50-by-68-foot spillway gates is capable of passing roughly 80,000 cubic feet of water per second based on current river conditions, the utility said.

Wanapum Dam

The Wanapum Dam stretches more than a mile across the Columbia River, just downstream from I-90.

"In a worst-case scenario, if one of the spillway sections failed, the remainder of the spillways and the main dam structure would remain intact," the utility said. "Under current conditions, the amount of water that would flow through this section of the dam would be within the range of normal river conditions."

The dam is still generating electricity for 45,000 customers. No repair plan or cost estimate has been released.

About the Dam

Named for a Native American tribe that lives along a stretch of the Columbia River, Wanapum Dam is located six miles downstream from Vantage, WA; 18 miles upstream of Priest Rapids Dam; and 415 miles above the mouth of the river. It is just downstream from where Interstate 90 crosses the river.

The $93.2 million structure opened in July 1963 after four years of construction. Wanapum Dam was financed by long-term revenue bonds that were retired through the sale of power.

The dam is 8,320 feet long and 185 feet high from its deepest excavation point.

   

Tagged categories: Concrete; Cracks; Infrastructure; Locks and dams; Rehabilitation/Repair

Comment from Terry Wunderlich, (3/4/2014, 4:04 AM)

What about the Hanford Site and runoff into the Columbia River?


Comment Join the Conversation:

Sign in to our community to add your comments.

Advertisements
 
International Bridge Conference
 
2017 International Bridge Conference
 
June 4-8, 2017, National Harbor, Maryland
 

 
Industrial Vacuum Equipment Corp.
 
Hurricane Vacuums
& Dust Collectors
 
Vacuum and dust collector hose, filters and related accessories.
IndustrialVacuum.com
 

 
SEMicro Division, M.E. Taylor Engineering, Inc.
 
Coatings Adhesion Testers
 
The PATTI® accurately measures the bond strength between coating & substrate. Outfitted properly, the surface can be rough, porous, or curved & >10K psi strong!
 

 
SAFE Systems, Inc.
 
Portable Dust Collectors for Tough Environments
 
Trailer and skid-mounted models in numerous sizes, powered by electric and/or diesel. Sloped roofs, multiple dust inlets, high static, dampered fans. Lockable power & drive compartments.
 

 
BASF
 
New resins from BASF will have metals loving water!
 
Excellent corrosion resistance, low VOC, high gloss, thin films www.basf.us/industrialcoatings dpsolutions@basf.com 800-231-7868
 

 
Corrosion Probe, Inc.
 
From Detection to Correction
 
Corrosion Probe, Inc. has the Most Concrete Coatings Experience and Expertise. Contact us today at
860-767-4402, www.cpiengineering.com
 

 
HoldTight Solutions Inc.
 
NO FLASH RUST - NO CONTAMINANTS
 
Our HoldTight®102 salt remover & flash rust
preventer prevents flash
rust by removing surface contaminants. Contact us
for your nearest distributor.
(800) 319.8802 sales@holdtight.com
 

 
Mitsubishi Gas Chemical America
 
Performance Amine 1,3-BAC
 
A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.
 

 
Polygon
 
POLYGON - Temporary Humidity Control
 
We specialize in innovative climate control solutions for industrial painting, utilizing alternative energy sources and combining desiccants with heating or cooling.
 

 
Montipower, Inc.
 
The MBX Bristle Blaster
 
Get a 2.7 to 3.3 mil profile and a Near White Metal Clean. For info visit www.mbxit.com or call 877 629-8777
 

 
 
 

Technology Publishing Co., 2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@paintsquare.com


The Technology Publishing Network

Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

 
EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us