PaintSquare.com


The First Word in Protective & Marine Coatings

A Product of Technology Publishing / PaintSquare
JPCL | PaintSquare News | Durability + Design | Paint BidTracker

Paint and Coatings Industry News

Main News Page


65-Foot Crack Found in WA Dam

Tuesday, March 4, 2014

More items for Program/Project Management

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.

Minerals Research & Recovery
PREMIUM SLAG ABRASIVES

Visit mrrinc.com In surface preparation tests run for NIOSH by an independent company, Sharpshot® was shown to be the best slag abrasive for cutting speed and cost per sq. ft.
Call Steve: 520-297-4626


SAFE Systems, Inc.
Enduroguard -
The Tough Cable
for a Tough Industry.

Reduce maintenance costs and down time, increase job site safety with Enduroguard Cable. Available exclusively from SAFE Systems. UL listed, flexible, abrasion resistant and cut resistant.


Simpson Strong-Tie
Repair, Protect & Strengthen

Need a coating? Turn to Fox. We have solutions to repair, protect and strengthen concrete, steel and wood substrates. Call 888-760-0369 or email info@foxind.com


LS Industries
LS Blasters: Optimum Steel Cleaning Efficiency

Simplify surface prep with the precise shot control of LS Blasters. Our blast technology delivers optimum coverage and finish. 800-533-8008


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


Surface Prep Supply
Surface Prep Supply

Blast It! Coat It! We have you covered every step of the way. Supplier of:
• Abrasives
• Equipment
• Accessories
• Protective Coatings
888-331-7737(PREP)


EDCO - Equipment Development Co. Inc.
American Manufacturing

Is coming back, is more competitive, and is higher
in quality. Well EDCO never left, we never lost our competitiveness, and we
have always maintained
our high level of quality.
Call 800-638-3326 or visit
us @ edcoinc.com

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design Paint BidTracker JPCL Europe

 
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
 

© Copyright 2000-2014, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com