News & Operations Blog

Change Order

Posted on Monday, February 13th, 2017

Date: Mon, Feb 13, 2017 at 9:47 AM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

02/13/2017       1300        55,000             50,000

02/13/2017       1800        50,000             45,000

Comment:  Flood control/storage management

Issued by:  P. Manza

Change Order

Posted on Sunday, February 12th, 2017

Date: February 12, 2017 at 10:20:18 AM PST
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

02/12/2017       2200       70,000             65,000

02/13/2017       0300        65,000            60,000

02/13/2017       0800        60,000            55,000

Comment:  Flood control

Issued by:  J. Sandberg

Change Order

Posted on Sunday, February 12th, 2017

Date: February 11, 2017 at 12:14:31 PM PST
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

02/12/2017       0600        80,000             75,000

02/12/2017       1000        75,000             70,000

Comment:  Flood control

Issued by:  J. Sandberg

Change Order

Posted on Thursday, February 9th, 2017

Date: Thu, Feb 9, 2017 at 11:07 AM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

02/09/2017       1300        70,000             75,000

02/09/2017       1400        75,000             80,000

Comment:  Flood control

Issued by:  P. Manza

Change Orders

Posted on Thursday, February 9th, 2017

 

Date: February 8, 2017 at 9:29:31 PM PST
Subject: Nimbus Dam – Change Order – CORRECTION

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

02/09/2017       0800        55,000             60,000

02/09/2017       0900        60,000             65,000

02/09/2017       1000        65,000             70,000

Comment:  Flood control

Issued by:  P. Manza


Date: February 8, 2017 at 9:17:02 PM PST
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

02/08/2017       2300        40,000             45,000

02/09/2017       0001        45,000             55,000

Comment:  Flood control

Issued by:  P. Manza


Here is Sacramento Bee’s article with some great footage:

http://www.sacbee.com/news/local/article131652189.html

Change Order

Posted on Wednesday, February 8th, 2017

Date: Wed, Feb 8, 2017 at 2:23 PM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

02/08/2017       1600        30,000             35,000

02/08/2017       1700        35,000             40,000

Comment:  Flood control

Issued by:  P. Manza

Sacramento Bar – after high flows

Posted on Wednesday, February 8th, 2017

With the river heading back up to 30,000 cfs, it seemed appropriate to pause and take a quick look at what has shifted since the fall. The first picture is pre-project (2015, Google Earth) and the river is flowing right to left around the large gravel bar.

This photo is shortly after construction with the river flowing at 1,600 cfs. We processed about 50,000 cubic yards of material to create the side channel and lower the floodplain habitat so that it inundates more frequently. About half of the processed material went into the main channel to create spawning habitat (you can see it as the lighter colored in river area). These projects are designed to provide maximum habitat at 1,750 cfs but remain functional at higher flows.

Flow at 1600 cfs

The aerial below shows Sacramento Bar with 20,000 cfs flowing down the river. We understand that these projects are never permanent, which is why we aim to do one each year without and end date.

Sacramento Bar 20,000 cfs

This image shows the river flowing at 8,000 cfs looking downstream after the 60,000 cfs flood flow. You can see gravel movement on the bar and upper portion of the side channel. We’ve noticed some movement of woody material, some has migrated off-site and some has been replaced.

8,000 cfs flowing downstream.

 

With the flows still changing, we do not plan to do any significant monitoring until flood season passes and there is more stability. We are hoping to collaborate with SAFCA, USFWS, and Reclamation to update the digital elevation model to accurately model the river from nimbus to the mouth, and levee to levee.

 

Change Order

Posted on Monday, February 6th, 2017

Date: Mon, Feb 6, 2017 at 9:40 AM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

02/06/2017       1200        15,000             17,500

02/06/2017       1300        17,500             20,000

02/06/2017       1400        20,000            23,500

02/06/2017       1500        23,500            27,000

02/06/2017       1600        27,000            30,000

Comment:  Flood control

Issued by:  P. Manza

Change Order

Posted on Friday, February 3rd, 2017

Date: Fri, Feb 3, 2017 at 3:27 PM
Subject: Nimbus Dam – Change Order – CORRECTION

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

02/04/2017       0800        7,250             10,000

02/04/2017       0900        10,000            12,500

02/04/2017       1000        12,500            15,000

Please prioritize releases above power plant capacity thru the upper outlets as much as possible.

Comment:  Flood control/Storage management

Issued by:  P. Manza

Change Order

Posted on Wednesday, February 1st, 2017

Date: Tue, Jan 31, 2017 at 9:12 AM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River.

Date               Time         From (cfs)           To (cfs)

02/02/2017       0600            6,400               7,250

Comment:  Storage management

Issued by: R. Field