Category Archives: Uncategorized

Change Order

Posted on Tuesday, May 23rd, 2017

Date: Tue, May 23, 2017 at 10:02 AM
Subject: Nimbus Dam – Change Order

Please make the following release changes at Nimbus Dam:

Date               Time         From (cfs)      To (cfs)

05/24/2017      2000            9,500             9,100

05/24/2017      2100            9,100             8,700

05/24/2017      2200            8,700             8,300


05/25/2017      2000            8,300             8,000

05/25/2017      2100            8,000             7,650

05/25/2017      2200            7,650             7,300


05/26/2017       2000            7,300             7,000

05/26/2017       2100            7,000             6,700

05/26/2017       2200            6,700             6,400

Comment:  Reduce flows for Memorial Day weekend

Issued by:  P. Manza

American River Group Temperature Plan & Handouts

Posted on Tuesday, May 23rd, 2017



Reclamation aims to fill the reservoir by late June, with a possible lowering to 5,000 – 6,000 cfs for Memorial Day weekend for boater & rafter safety.

Initial iCPMM modeling suggests that ATSP schedule 23 (64 degrees with one-degree buffer at Watt Avenue) can be achieved. This is based on all upper shutters being lowered. Currently only the lower and middle shutters are lowered units 1 and 2 (unit 3 is our for maintenance). The upper shutters are not in place because of a large amount of debris. This will impact the cold water pool if not resolved. Divers may be able to clear the debris, but that is not known.

May – Sep Storage & Flow Projection


Click here for full ARG Handouts.

Mulch Mayhem!

Posted on Wednesday, May 3rd, 2017

Get ready for MULCH MAYHEM!

Free water-conserving mulch will be available to local residents during Mulch Mayhem events throughout the Sacramento region on Saturdays May 6 and 20. These free events are designed to help local residents get their landscapes and yards ready for the hot days of summer. Mulch slows evaporation, moderates soil temperature and even controls weeds. As it breaks down, mulch also adds helpful nutrients to the soil.
“Mulch might be one of the most under-appreciated water conservation tools at our disposal,” said Amy Talbot, Regional Water Authority Water Efficiency Program Manager. “Mulch is like icing on a cake because it keeps the soil moist the way icing keeps a cake moist.” Water managers estimate that residents can save 30 gallons of water for every 1,000 square feet just by adding two to three inches of organic mulch (e.g., leaves and wood chips) around trees and plants.
Sponsored by the Regional Water Authority and local water providers, Mulch Mayhem will take place at the following locations, days and times (until supplies last):

Saturday, May 6

Antelope Gardens | 9 am – 12 pm
7800 Antelope North Rd. in Antelope
Hosted by Sacramento Suburban Water District

Carmichael Water District | 9 am – 12 pm
7837 Fair Oaks Blvd. in Carmichael
Hosted by Carmichael Water District

Sierra College, Overflow Lot | 8 am – 12 pm
Corner of Rocklin Rd. and El Don Dr. (opposite the campus)
Hosted by Placer County Water Agency
and the City of Lincoln

Saturday, May 20

Click for enlarged flyer

Placer County Fair Grounds, Lot B | 9 am – 12 pm
800 All American City Blvd. in Roseville
Hosted by the City of Roseville

Sacramento Marina | 8 am – 12 pm
2 Broadway in Sacramento
Hosted by the City of Sacramento

San Juan Water District | 9 am – 12 pm
9935 Auburn Folsom Rd. in Granite Bay
Hosted by the San Juan Water District

Free mulch is limited to one yard per customer (enough to fill a pickup truck), must be for personal use only (not for resale or commercial use) and will be offered on a first come, first-served basis until supplies are gone. Customers are encouraged to bring their own shovels, containers, tarps or other items to cover the mulch and must provide their own way to haul it away.

Visit for more information.

Winner of 2016 Sacramento Environmental Commission Award!

Posted on Monday, April 24th, 2017

The Water Forum along with our project partners, Sacramento County Drainage, Sacramento County Regional Parks, Soil Born Farms, City of Rancho Cordova, SAFCA, California Native Plant Society and cbec eco engineering were awarded the 2016 Sacramento Environmental Commission Award for the Cordova Creek Naturalization Project!

The award recognizes community members who share the mission of promoting high-quality environmental projects that make a positive contribution to the community.

Thank you, Sacramento Environmental Commission!

Richard Hunn, Chair Sacramento Environmental Commission, David Bowlen, Project Manager, Sacramento County Drainage, Juliette Robinson, Sacramento County Department of Community Development, Lilly Allen, Water Forum, Chris Bowles, cbec ecoengineering


Change Order

Posted on Friday, March 3rd, 2017

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


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:

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 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

50,000 cfs Aerial Footage

Posted on Monday, January 23rd, 2017

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.