Category Archives: Uncategorized

Flow & Storage Projection

Posted on Friday, March 17th, 2017
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Reclamation outlined flows and storage for March – August at the monthly American River Group yesterday. The full handouts are below, we expect a temperature plan next month.

ARG Handouts Mar 2017

Change Order

Posted on Friday, March 3rd, 2017
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Date: Fri, Mar 3, 2017 at 9:43 AM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

03/07/2017      0800            8,000             7,650

03/07/2017      1000            7,650             7,300

 

03/08/2017       0800            7,300             7,000

03/08/2017       1000            7,000             6,700

03/08/2017       1200            6,700             6,400

 

03/09/2017      0800             6,400             6,150

03/09/2017      1000             6,150             5,900

03/09/2017      1200             5,900             5,650

 

03/10/2017      0800              5,650             5,400

03/10/2017      1000              5,400             5,150

03/10/2017      1200              5,150             5,000

 

Comment:  Inflow management

Issued by:  P. Manza

Change Orders

Posted on Thursday, February 9th, 2017
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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

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 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

50,000 cfs Aerial Footage

Posted on Monday, January 23rd, 2017
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This wonderful footage was filmed on January 13, 2017, shows the lower American River at 50,000 cfs. Be sure to look out for the recent gravel projects at Nimbus Basin and Sacramento Bar.

 

Change Order

Posted on Friday, January 20th, 2017
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Date: Fri, Jan 20, 2017 at 9:49 AM
Subject: Nimbus Dam – Change Order

Please make the following release changes to the American River

Date               Time         From (cfs)      To (cfs)

01/21/2017       0800           30,000             25,000

01/21/2017       0900           25,000             20,000

01/22/2017       0800            20,000            18,650

01/22/2017      1000            18,650             17,300

01/22/2017      1200            17,300             16,000

01/23/2017       0800           16,000             15,000

01/23/2017      1000            15,000             14,000

01/23/2017      1200            14,000             13,000

01/24/2017       0800           13,000             12,300

01/24/2017       1000            12,300             11,600

01/24/2017       1200            11,600             11,000

01/25/2017       0800           11,000             10,500

01/25/2017      1000            10,500             10,000

01/25/2017      1200            10,000               9,500

01/26/2017       0800             9,500               9,100

01/26/2017      1000              9,100               8,700

01/26/2017      1200              8,700               8,300

01/27/2017       0800             8,300               8,000

Comment:  Storage management

Issued by:  P. Manza