4 G. "Floods after dams"

   

The Four Lower Snake River Dams were constructed under the Flood Control Act of 1944 and 1945.

  
The Four Lower Snake River Dams provide Flood Risk Management against the annual flooding events from the Snake River.  With out these dams there would be annual flooding events in Tri-Cites, Portland and Vancouver.


 

" Keep Portland Wierd"
Photo Credit : 98.7 The Bull with
Robb Lawrence, Dec 8 2015
Flooding, Dec 8 2015

     Flooding of the Portland/Vancouver area is never brought up by the dam breachers or dam removal crowd.  For the most part out of site out of mind, until an event happens.  There are major flooding events contentiously happening and will continue to happen.   There is the 10,000 year event, 500 year event, 100 year event, 50 year event and just normal small flooding events we have seen recently.

Let us not forget the Vanport flood of 1948 where 50 people lost their life ( 15 documented, 35 unaccounted for and presumed dead ) 46,000 lost their homes ( Property damage of 102 million ). 

     Most recently the flooding of the Portland area in 1996,  
( Property damage of 3 billion ) and flooding in 2009, 2012, 2015. Flood control was one of the major reasons there were more dams authorized by congress because a large amount of the flooding water comes from the Snake River.   The Lower Snake River dams help prevent these floods from being much more devastating.  In a undamed ( free flowing ) river there would be more property damage and human death from these floods.


Flood Videos:


The Four Lower Snake River Dams were constructed under the Flood Control Act of 1944 and 1945.

Also you should know that during the 1996 Portland area flood the U.S. Army Corps of Engineers had a active plan involved the 4 Snake River dams.  This resulted in very little damage occurring in the Portland area.   Unlike the 1949 flood, where there was widespread lose of life and property.

Ice Harbor

AUTHORIZATION: The Ice Harbor Project was authorized by Section 2 of the River and Harbor Act of 1945 (Public Law 79-14, 79th Congress, 1st Session), and was approved March 2, 1945, in accordance with House Document 704, 75th Congress, 3d Session. Recreation was authorized in the River and Harbor Act of 1944 (Public Law 78-534), as amended. The lake behind Ice Harbor Dam has been designated "Lake Sacajawea."

Ice Harbor Lock and Dam-Lake Sacajawea is Unit 1 of 4 included in the "Lower Snake River Project, Washington, and Idaho"

PROJECT: The project consists of Ice Harbor Dam (photo), powerhouse, navigation lock, two fish ladders, and facilities. The project provides navigation, hydroelectric generation, recreation, and irrigation.

Lower Monumental

AUTHORIZATION: This project was authorized by the Flood Control Act of 1945 (Public Law 79-14), in accordance with House Document 704. Recreation was authorized in the Flood Control Act of 1944 (Public Law 78-534), as amended. Public Law 95-285, 95th Congress, approved May 25, 1978, designated the lake behind Lower Monumental Dam as "Lake Herbert G. West." Lower Monumental Lock and Dam is Unit 2 of 4 from the "Lower Snake River Project, Washington, and Idaho."

PROJECT: The project includes Lower Monumental Dam (photo), powerhouse, navigation lock, two fish ladders, and appurtenant facilities. The project provides navigation, hydroelectric generation, recreation, and irrigation.

Little Goose

AUTHORIZATION: The project was authorized by Section 2 of the Flood Control Act of 1945 (Public Law 79-14), 79th Congress, 1st Session. It was approved on March 2, 1945, in accordance with House Document 704, 75th Congress, 3d Session. Recreation was authorized in the River and Harbor Act of 1944, as amended. Public Law 91-638, 91st Congress, 2d Session, approved December 31, 1970, designated the lake behind Little Goose Dam as "Lake Bryan" in honor of the late Doctor Enoch A. Bryan.

PROJECT: The project consists of Little Goose Dam (photo), powerhouse, navigation lock, two fish ladders, and appurtenant facilities. The project provides navigation, hydroelectric generation, recreation, and irrigation. Little Goose Lock and Dam is Unit 3 of 4 from the "Lower Snake River Project, Washington, and Idaho."

Lower Granite

AUTHORIZATION: The project was authorized by Section 2 of the Flood Control Act of 1945 (Public Law 79-14), 79th Congress, 1st Session. It was approved March 2, 1945, in accordance with House Document 704, 75th Congress, 3d Session. Recreation was authorized in the River and Harbor Act of 1944 (Public Law 78-534, as amended. Lower Granite Lock and Dam is Unit 4 of 4 from the "Lower Snake River Project, Washington, and Idaho."

PROJECT: This project consists of Lower Granite Dam (photo), powerhouse, navigation lock, two fish ladders, and appurtenant facilities. The project provides navigation, hydroelectric generation, recreation, and  irrigation.



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