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20-005 Mill Creek Channel in Walla Walla worked as designed, says U.S. Army Corps of Engineers officials: Walla Walla District Commander cites staff and community partnership, ready to help neighboring communities begin recovering from flooding

Published Feb. 11, 2020
Corps official monitoring flows in the Mill Creek Channel.

Corps official monitoring flows in the Mill Creek Channel.

Corps official monitoring flows in the Mill Creek Channel.

Corps official monitoring flows in the Mill Creek Channel.

Water splashing up on a bridge in Milton Freewater on Feb. 7.

Water splashing up on a bridge in Milton Freewater on Feb. 7.

Sandbag operations for Russell Creek Diffuser on Sunday, Feb. 9.

Sandbag operations for Russell Creek Diffuser on Sunday, Feb. 9.

Mill Creek Channel at sunset on Feb. 7.

Mill Creek Channel at sunset on Feb. 7.

Walla Walla District Corps of Engineers Emergency Operation Center with Corps staff managing the Mill Creek Channel flows.

Walla Walla District Corps of Engineers Emergency Operation Center with Corps staff managing the Mill Creek Channel flows.

Project staff clearing debris from Russell Creek canal, Feb. 11.

Project staff clearing debris from Russell Creek canal, Feb. 11.

Corps Official recording the flows through the Mill Creek Channel.

Corps Official recording the flows through the Mill Creek Channel.

Mill Creek Dam Division Works.

Mill Creek Dam Division Works.

An excavator driving towards eroding section of road in Milton Freewater, Feb. 7.
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An excavator driving towards eroding section of road in Milton Freewater, Feb. 7.

Erosion to a road in Milton Freewater on Feb. 7.
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Erosion to a road in Milton Freewater on Feb. 7.

Bennington Lake.
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Bennington Lake.

Corps officials surveying erosion in Milton Freewater, Feb. 7.
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Corps officials surveying erosion in Milton Freewater, Feb. 7.

Bennington Lake.
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Bennington Lake.

Jamie Bond, Civil Engineer of the Walla Walla Corps of Engineers, overseeing floodfighting efforts in Milton Freewater on Friday Feb. 7.
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Jamie Bond, Civil Engineer of the Walla Walla Corps of Engineers, overseeing floodfighting efforts in Milton Freewater on Friday Feb. 7.

Walla Walla District Corps of Engineers floodfighting efforts in Milton Freewater on Friday Feb. 7.
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Walla Walla District Corps of Engineers floodfighting efforts in Milton Freewater on Friday Feb. 7.

Corps official monitoring flows in Milton Freewater.
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Corps official monitoring flows in Milton Freewater.

Residential flooding in Milton Freewater.
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Residential flooding in Milton Freewater.

Erosion near Marie Dorion Park in Milton Freewater.
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Erosion near Marie Dorion Park in Milton Freewater.

Water splashing up on a bridge in Milton Freewater, Feb. 7.
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Water splashing up on a bridge in Milton Freewater, Feb. 7.

Walla Walla District Corps of Engineers floodfighting efforts in Milton Freewater on Friday Feb. 7.
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Walla Walla District Corps of Engineers floodfighting efforts in Milton Freewater on Friday Feb. 7.

Walla Walla District Corps of Engineers floodfighting efforts in Milton Freewater on Friday Feb. 7.
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Walla Walla District Corps of Engineers floodfighting efforts in Milton Freewater on Friday Feb. 7.

Walla Walla District Corps of Engineers floodfighting efforts in Milton Freewater on Friday Feb. 7.
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Walla Walla District Corps of Engineers floodfighting efforts in Milton Freewater on Friday Feb. 7.

Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and Alan Feistner, Deputy District Engineer for the Walla Walla District Corps of Engineers, examine a bridge off Old Hwy 12 in Walla Walla.
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Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and Alan Feistner, Deputy District Engineer for the Walla Walla District Corps of Engineers, examine a bridge off Old Hwy 12 in Walla Walla.

Wallula Bridge
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Wallula Bridge

Wallula Bridge
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Wallula Bridge

Wallula Bridge
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Wallula Bridge

Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers examines Wallula Bridge off Old Hwy 12 in Walla Walla.
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Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers examines Wallula Bridge off Old Hwy 12 in Walla Walla.

Wallula Bridge
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Wallula Bridge

The District's Chief of Engineering, Dwayne Weston examines Wallula Bridge off Old Hwy 12 in Walla Walla.
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The District's Chief of Engineering, Dwayne Weston examines Wallula Bridge off Old Hwy 12 in Walla Walla.

The District's Chief of Engineering, Dwayne Weston and Alan Feistner, Deputy District Engineer for the Walla Walla District Corps of Engineers, examine Wallula Bridge off Old Hwy 12 in Walla Walla.
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The District's Chief of Engineering, Dwayne Weston and Alan Feistner, Deputy District Engineer for the Walla Walla District Corps of Engineers, examine Wallula Bridge off Old Hwy 12 in Walla Walla.

Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and the District's Chief of Engineering, Dwayne Weston, oversee Russel Creek in Walla Walla.
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Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and the District's Chief of Engineering, Dwayne Weston, oversee Russel Creek in Walla Walla.

Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and the District's Chief of Engineering, Dwayne Weston, oversee Russel Creek in Walla Walla.
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Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and the District's Chief of Engineering, Dwayne Weston, oversee Russel Creek in Walla Walla.

Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and the District's Chief of Engineering, Dwayne Weston, monitoring the Walla Walla River near Milton Freewater.
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Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and the District's Chief of Engineering, Dwayne Weston, monitoring the Walla Walla River near Milton Freewater.

Milton Freewater
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Milton Freewater

Milton Freewater
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Milton Freewater

Milton Freewater
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Milton Freewater

Erosion near Marie Dorion Park in Milton Freewater.
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Erosion near Marie Dorion Park in Milton Freewater.

Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and the District's Chief of Engineering, Dwayne Weston, survey the erosion near Marie Dorion Park in Milton Freewater.
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Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and the District's Chief of Engineering, Dwayne Weston, survey the erosion near Marie Dorion Park in Milton Freewater.

Erosion near Marie Dorion Park in Milton Freewater.
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Erosion near Marie Dorion Park in Milton Freewater.

Milton Freewater
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Milton Freewater

Milton Freewater
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Milton Freewater

Milton Freewater
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Milton Freewater

Jamie Bond, Civil Engineer of the Walla Walla Corps of Engineers, informs Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and Alan Feistner, Deputy District Engineer for the Walla Walla District Corps of Engineers, about water levels in the Walla Walla River in Milton Freewater.
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Jamie Bond, Civil Engineer of the Walla Walla Corps of Engineers, informs Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and Alan Feistner, Deputy District Engineer for the Walla Walla District Corps of Engineers, about water levels in the Walla Walla River in Milton Freewater.

Natural Resources Manager Chris Alford monitoring Mill Creek flows.
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Natural Resources Manager Chris Alford monitoring Mill Creek flows.

Walla Walla District Corps of Engineers Emergency Operation Center with Corps staff managing the Mill Creek Channel flows.
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Walla Walla District Corps of Engineers Emergency Operation Center with Corps staff managing the Mill Creek Channel flows.

Excavator removes debris from Mill Creek Channel.
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Excavator removes debris from Mill Creek Channel.

Justin Stegall, Mill Creek Project Manager for the Walla Walla Corps of Engineers, briefs Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and Walla Walla County Commissioners Todd Kimball and Greg Tompkins on the status of the Mill Creek Channel.
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Justin Stegall, Mill Creek Project Manager for the Walla Walla Corps of Engineers, briefs Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, and Walla Walla County Commissioners Todd Kimball and Greg Tompkins on the status of the Mill Creek Channel.

Due to continuous rains, U.S. Army Corps of Engineer officials have increased water flows into Mill Creek to 3,900 cubic feet per second. Although the public will see a substantial increase in water flowing through Mill Creek and Walla Walla, the Mill Creek channel is operating as intended and Corps officials are continuously monitoring its water levels. Meanwhile, Corps officials continue to divert water into Bennington Lake which is closed to public access until further notice. As a precaution, Corps officials are asking the public to avoid levees, high water areas and Bennington Lake.
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Due to continuous rains, U.S. Army Corps of Engineer officials have increased water flows into Mill Creek to 3,900 cubic feet per second. Although the public will see a substantial increase in water flowing through Mill Creek and Walla Walla, the Mill Creek channel is operating as intended and Corps officials are continuously monitoring its water levels. Meanwhile, Corps officials continue to divert water into Bennington Lake which is closed to public access until further notice. As a precaution, Corps officials are asking the public to avoid levees, high water areas and Bennington Lake.

mill creek water level
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mill creek water level

Titus Creek crossing outlet
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Titus Creek crossing outlet

Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers greets Walla Walla City workers who are monitoring the Mill Creek Channel.
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Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers greets Walla Walla City workers who are monitoring the Mill Creek Channel.

Prakash Kaini, Civil Engineer for the Walla Walla Corps of Engineers overseeing the Mill Creek Channel on South Clinton St. in Walla Walla.
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Prakash Kaini, Civil Engineer for the Walla Walla Corps of Engineers overseeing the Mill Creek Channel on South Clinton St. in Walla Walla.

An excavator removes debris from the Mill Creek Channel.
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An excavator removes debris from the Mill Creek Channel.

Jeffrey Bonafilia, Planning Study Specialist, for the Walla Walla Corps of Engineers recording incoming flows of the Mill Creek Channel.
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Jeffrey Bonafilia, Planning Study Specialist, for the Walla Walla Corps of Engineers recording incoming flows of the Mill Creek Channel.

Walla Walla County Command Center.
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Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, at the Walla Walla County Command Center.

Flooding in residential area off Mill Creek Rd.
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Flooding in residential area off Mill Creek Rd.

Bennington Lake
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Bennington Lake

Engineer Alex Hammond, a Dam and Levee Safety Manager for the Walla Walla District Corps of Engineers monitors Bennington Lake levels.
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Engineer Alex Hammond, a Dam and Levee Safety Manager for the Walla Walla District Corps of Engineers monitors Bennington Lake levels.

Mill Creek Channel.
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Mill Creek Channel.

Alex Hammond, Dam and Levee Safety Manager for the Walla Walla Corps of Engineers, overlooks the Mill Creek Channel.
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Alex Hammond, Dam and Levee Safety Manager for the Walla Walla Corps of Engineers, overlooks the Mill Creek Channel.

Mill Creek Diversion Dam near Rooks Park.
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Mill Creek Diversion Dam near Rooks Park.

Mill Creek Diversion Dam.
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Mill Creek Diversion Dam.

County Commissioners Todd Kimball and Greg Tompkins and Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, travel along the Mill Creek Channel.
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County Commissioners Todd Kimball and Greg Tompkins and Lt. Col. Christian Dietz, Commander of the Walla Walla District Corps of Engineers, travel along the Mill Creek Channel.

Mill Creek Channel.
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Mill Creek Channel.

Twenty four years to the day in 1996 the U.S. Army Corps of Engineers Walla Walla District and Walla Walla engaged in one of the most significant flood fights along the Mill Creek Channel.

 Walla Walla means the “place of many waters” and the significance of that wasn’t lost on LTC Christian Dietz, commander of the U.S. Army Corps of Engineers Walla Walla District, whose men and women, last week, navigated through warm winter rainstorms and the highest peak inflows ever recorded at Mill Creek Project to keep the City of Walla Walla dry as flood waters hit the surrounding communities of Dayton, Waitsburg and Milton-Freewater and Touchet.

“Our staff live and work in these communities so we are very much a part of that interwoven fabric,” Dietz said. “We have a partnership with these communities which we take to heart during a flood fight like we just endured.”

That partnership was on full display as the District’s Readiness staff organized the Corps’ crisis action team and began engaging with their Walla Walla County partners while Walla Walla County Commissioners Todd Kimball and Greg Tompkins saw first-hand that flood fight effort while touring the Mill Creek Project and Bennington Lake on Friday morning. They learned how the Corps manages flood water by operating flood gates and diversion channels to redirect excess water to Bennington Lake and ensure that water flowing down the Mill Creek Channel stays off the streets of Walla Walla.  

Major flood events occurred in Walla Walla in 1931, 1964 and 1996. It was the destructive flood of 1931 in which Mill Creek flowed through Walla Walla that led community leaders to petition Congress to build the Mill Creek Flood risk reduction project and downstream channel in 1941 to protect the city from future floods

Warm winter temperatures and 8 inches of rain in the Blue Mountains over 48 hours February 6-7, 2020 inundated the region and led Corps officials to begin preparing for a flood fight.

“At that point we had two very specific public safety goals,” Dietz said. “Avoid fatalities and injuries and keep Walla Walla dry.”

For about 36 hours from Thursday morning to Friday night, Corps officials continuously monitored water flows up and down the Mill Creek Channel and throughout the Walla Walla Basin. They increased Bennington Lake diversions Thursday night, focused on effectively managing the amount of water going through town with those into Bennington Lake.

The Mill Creek Project personnel, supplemented by engineering staff were on-site diverting water into Bennington Lake, adjusting gates as needed and monitoring the surrounding infrastructure. As rains continued, it was a tense moment for hydraulic engineer Jonathan Roberts who stayed at the Mill Creek project assessing project inflow, quickly changing rain forecasts, and decreasing storage space.   

“On Friday morning, around 2 a.m. we saw the inflow hydrograph jump up significantly at Kooskooski,   passing the 1996 flood levels with more rain in the forecast,” Roberts said.”

“At that point, balancing how much water to push down the Mill Creek Channel versus what to divert into the reservoir became critical.  We coordinated with John Heitstuman, the District Hydrology Chief, who helped us navigate through the 1996 flood. At times like these there is no substitute for having experienced hands on the helm, and the decision was made to raise the channel’s flows to accommodate the incoming flood water,” he said.

The Corps increased flows through the Mill Creek Channel from 1,500 cubic feet per second (cfs) to 3,800 cfs by Friday morning. Overnight Bennington Lake levels rose from 15% to 65% full, so Corps staff began diverting flows of 100 cubic feet per second into Russell Creek, a secondary outlet in order to conserve as much space as possible should the rain continue.   

By noon, Bennington Lake filled to about 72% full, with the Corps maintaining flows of 3,800 cfs through the Mill Creek channel through the City of Walla Walla.

By 5 p.m. on Friday, Bennington Lake had reached 80% capacity, and though weather forecasters were anticipating another inch of rain, the rain had stopped and inflows decreased. At that point the Corps stopped diverting water into the lake and were able to slow total inflows into the Mill Creek Channel to about 3500 cfs, which saved approximately 20% storage capacity for uncertain precipitation. 

Throughout Friday night flows began to decrease and by Saturday morning they had dropped to around 2,000 cfs through the channel. In addition, the Operating project started returning flows from the lake into the Mill Creek Channel. By noon on Saturday, Bennington Lake levels dropped to 70% of its capacity.

Ultimately, the Corps’ Mill Creek flood management system functioned as designed.

“People normally enjoy the Mill Creek Project and Bennington Lake on sunny cloudless days, sometimes wondering why the Corps operates parks and recreational areas,” said Justin Stegall, Mill Creek Project manager.

“Events like this demonstrate that the project’s primary function is Flood Damage Reduction to protect the City of Walla Walla. With 78 years in service protecting Walla Walla and the downstream community, the Mill Creek Project and Bennington Lake performed as designed. That allowed us to open Rooks Park to general public access on Saturday afternoon so people could see the project at work and enjoy some well-needed rest and recreation following a tense 36 hours.”

“With our maintenance crews continue working diligently to release stored flood water we will return recreation areas to full access as soon as it’s safe to do so, but this overall effort really speaks to the dedication and commitment of the Corps staff and our partners,” he added.

The next phase of Corps engagement includes helping the surrounding communities like Milton-Freewater, Waitsburg, Touchet, Dayton and others recover from the flood’s impacts.

“We’ve been to some of the surrounding communities directly impacted by flood waters,” Dietz said. “In the coming days we will be visiting more, and start working with local public officials and community leaders to further assess the damage and to help them identify their needs and the emergency response resources available to help start the recovery process,” Dietz said.

“Meanwhile, I have a tremendous amount of pride in the dedication and actions of our Corps staff and I’d like to thank our entire District team for the superb job they did for this great community. We were fortunate it didn’t rain more, but in many instances, flood fights are won before they’re ever fought because of outstanding planning and preparation,” he said.

 

Footage of the Mill Creek flooding found below.


Contact
CENWW-PA
509-527-7020
cenww-pa@usace.army.mil

Release no. 20-005