[env-trinity] TRRP's Deep Gulch and Sheridan Ck Project update - Washing of dirt from the site to occur during August Boat Dance flows

[Gutermuth, F.]

Dear Trinity River followers- Below is an update on our construction
project and the expected release of fine sediment from the site during high
flows during next week's flows.



*Deep Gulch –and Sheridan Creek Project update: *


The Trinity River Restoration Program has been working to construct the
Deep Gulch and Sheridan Creek Channel Rehabilitation Project this summer.
The Hoopa Valley and Yurok Tribal Team is working to complete in-channel
work by September 15. Details concerning the Project may be found in the
project description (Chapter 2) of the Deep Gulch and Sheridan Creek
Project environmental assessment / initial study (EA/IS) located at:
http://www.trrp.net/library/document/?id=2318


This is a large river restoration project, with an objective of creating
diverse and functioning river conditions/habitat – for salmon and
steelhead. Construction includes substantial in-river work and has been
progressing well. More than 50% of the in-river work and wood structures
are completed.


Due to the amount of in-river work required and the short in-river work
window (July 15 to September 15), it has been challenging to control
turbidity within permit levels. To date, the Tribal Team has generally done
this. They have constructed the project with one substantial release of
turbidity (dirty water) during work on August 7th.  Otherwise, work has
proceeded within permit limits.


Today (August 18), the tribal construction team is clearing the turbidity
controls (e.g., barriers that isolate equipment from the river during
excavation) to allow high flows to wash over the site in a safe and
unrestricted fashion. Trinity River flows will increase from Lewiston dam
(starting this Sunday) from 450 cubic feet per second (cfs) to a peak of
2650 cfs on Monday August 21 at about 10 am (See Boat Dance Ceremony Flow
Schedule – below). These flows will reach the Deep Gulch and Sheridan Creek
Project site 6 to 8 hours after they leave the dam and will wash over newly
exposed soils. There will be a substantial amount of dirt washed from the
site as much of the area will be underwater for several days. Water clarity
in the Trinity River downstream of Junction City will be decreased until
base flows are reached following the ceremonial releases.


After the flows have diminished, in-river construction of the Project will
continue with the objective to finish in-river work by September 15, 2017.


For more information on the project please contact Kevin Held at the
Trinity River Restoration Program office at 530.623.1800.





*Boat Dance Ceremony Flows Schedule: flows start this Sunday*

For flow information, please contact Reclamation’s Northern California Area
Office at 530-275-1554

FLOW RELEASES ARE LISTED BELOW:

Project: Lewiston Dam



Please make the following release changes to the Trinity River:



Date                Time             From (cfs)     To (cfs)



08/20/2017      1800             450               500

08/20/2017      2000             500               800

08/20/2017      2200             800               1050



08/21/2017      0001             1050             1300

08/21/2017      0200             1300             1550

08/21/2017      0400             1550             1800

08/21/2017      0600             1800             2050

08/21/2017      0800             2050             2250

08/21/2017      1000             2250             2650

08/21/2017      2000             2650             2450



08/22/2017      0001             2450             2250

08/22/2017      0400             2250             2050

08/22/2017      0800             2050             1850

08/22/2017      1200             1850             1750

08/22/2017      1600             1750             1650

08/22/2017      2000             1650             1550



08/23/2017      0001             1550             1450

08/23/2017      0400             1450             1350

08/23/2017      0800             1350             1250

08/23/2017      1200             1250             1150

08/23/2017      1600             1150             1050

08/23/2017      2000             1050             950



08/24/2017      0001             950               850

08/24/2017      0400             850               750

08/24/2017      0800             750               650

08/24/2017      1200             650               550

08/24/2017      1600             550               450





Comment:  Hoopa Valley Tribe Bi-annual Boat Dance Ceremony

Issued by:  R Field




Best Regards-
Brandt





Brandt Gutermuth
Environmental Scientist
Trinity River Restoration Program
530.623.1806 work
530.739.2802 cell
http://www.trrp.net/
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