News & Operations Blog

Change Order

Posted on Wednesday, February 8th, 2017
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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
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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
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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
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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
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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

Change Order- Revised

Posted on Monday, January 30th, 2017
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Date: Mon, Jan 30, 2017 at 9:53 AM
Subject: Nimbus Dam – Change Order REVISED

Please make the following release changes to the American River.  This change order supersedes the previous order and cancels the previous remaining release changes.  Releases will remain at the specified release detailed below:

Date               Time         From (cfs)           To (cfs)

01/31/2017       0100            7,300               7,000

01/31/2017       0300            7,000               6,700

01/31/2017       0500            6,700               6,400

Comment:  Storage management

Issued by: R. Field

Change Order

Posted on Monday, January 23rd, 2017
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Date: Mon, Jan 23, 2017 at 2:37 PM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)           To (cfs)

01/30/2017       0800           8,000                7,650

01/30/2017       1000           7,650                7,300

01/31/2017       0800            7,300               7,000

01/31/2017       1000            7,000               6,700

01/31/2017       1200            6,700               6,400

02/01/2017       0800            6,400               6,150

02/01/2017       1000            6,150               5,900

02/01/2017       1200            5,900               5,650

02/02/2017       0800            5,650               5,400

02/02/2017       1000            5,400               5,150

02/02/2017       1200            5,150               5,000

Comment:  Storage management

Issued by:  P. Manza