News & Operations Blog

Change Order

Posted on Saturday, January 14th, 2017

Date: Fri, Jan 13, 2017 at 3:14 PM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

01/14/2017       0800        40,000             35,000

01/14/2017       0900        35,000             30,000

Comment:  Flood control/Storage management

Issued by:  P. Manza

Change Order

Posted on Friday, January 13th, 2017

Date: Fri, Jan 13, 2017 at 10:46 AM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

01/13/2017       1500        50,000             45,000

01/13/2017       1600        45,000             40,000

Comment:  Flood control/Storage management

Issued by:  P. Manza

Change Order

Posted on Thursday, January 12th, 2017

Date: Thu, Jan 12, 2017 at 11:40 AM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

01/12/2017       1500        60,000             55,000

01/12/2017       1600        55,000             50,000

Comment:  Flood control/Storage management

Issued by:  P. Manza


Here is USACE’s current storage graph.

Change Order

Posted on Tuesday, January 10th, 2017

Date: Tue, Jan 10, 2017 at 3:19 PM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

01/10/2017       1600        50,000             55,000

01/10/2017       1700        55,000             60,000

Comment:  Flood control/Storage management

Issued by:  P. Manza

Change Order

Posted on Tuesday, January 10th, 2017

Date: Tue, Jan 10, 2017 at 8:00 AM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

01/10/2017       0900        40,000             45,000

01/10/2017       1300        45,000             50,000

Comment:  Flood control/Storage management

Issued by:  R. Field

Change Order

Posted on Monday, January 9th, 2017

Date: Mon, Jan 9, 2017 at 3:30 PM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

1/09/2017       1600        35,000             40,000

Comment:  Storage management

Issued by:  P. Manza

Change Order

Posted on Monday, January 9th, 2017

Date: Mon, Jan 9, 2017 at 12:35 PM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Please hold releases at 35,000 cfs until further notice.

Comment:  Insufficient head on Spillway gates to increase releases further at this time.  Additional release increases will be made as reservoir storage allows.

Issued by:  P. Manza

Change Order

Posted on Sunday, January 8th, 2017

After some back and forth about how high the flows should go, Reclamation has settled on 60,000 cfs by 5pm today. The change order is below. Here is a nifty link from the CA NV River Forcast Center about projected inflow.


Date: Sun, Jan 8, 2017 at 5:33 PM
Subject: Nimbus Dam – Change Order – CLARIFICATION

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

1/09/2017       1200        30,000             35,000

1/09/2017       1300        35,000             40,000

1/09/2017       1400        40,000             45,000

1/09/2017       1500        45,000             50,000

1/09/2017       1600        50,000             55,000

1/09/2017       1700        55,000             60,000

Comment:  Changed timing of increased releases due to changes in projected inflows to Folsom.

Issued by:  P. Manza

Change Order- Increase to 30,000 cfs

Posted on Friday, January 6th, 2017

Project:  Nimbus Dam

Please make the following release changes to the American River.

Date             Time            From (cfs)     To (cfs)

1/07/2017     0800           15,000            20,000

1/07/2017     0900           20,000            25,000

1/07/2017     1000           25,000            30,000

Comment:  Storage management/flood control

Issued by:   P. Manza

High Flows at Nimbus Basin

Posted on Wednesday, January 4th, 2017

Interested in the high flows over December in Nimbus Basin? So are we. Thankfully, Reclamation used their last aerial flight to capture 35,000 cfs on the LAR. The files are gigantic and somewhat painful to stitch together, shrink, and upload, but here is a great shot I had to share. I’ve paired it with pre and post-project photos to remind everyone what it has looked like under all that water. We hope to spend time this year assessing what has happened to our restoration sites and discuss returning next year.