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DateDaily Comments
8/29/2016 12:00:00 AM"2016 FOP: 18 kcfs/18 kcfs; 24-hr Avg Spill = 8.6 kcfs; LGR Tailrace (12-hr Avg TDG = 106%) - TDG waiver not exceeded; LGS Forebay (12-hr Avg TDG = 105%) - TDG waiver not exceeded;"
123

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* Graph runs 7 days, Monday - Sunday.
Spill Season Update

 


 

In accordance with the 2016 Fish Operations Plan (FOP), voluntary spill was initiated at the Snake River Projects at 0001 hours on April 3, 2016 and will run through August 31, 2016.  The 2016 Fish Operations Plan calls for the following spill levels at the Federal Snake River Projects. 

Project

Spring Spill

(April 3-June 20)

Summer Spill

(June 21-August 31)

Day / Night Spill

Day / Night Spill

Lower Granite

20 Kcfs / 20 Kcfs

18 Kcfs / 18 Kcfs

Little Goose

30% / 30%

30% / 30%

Lower Monumental**

Gas Cap / Gas Cap

17 Kcfs/17 Kcfs

Ice Harbor

30% / 30% vs 45 Kcfs / Gas Cap

30% / 30% vs 45 Kcfs / Gas Cap

In accordance with the 2016 Fish Operations Plan, voluntary spill is to be initiated at the Lower Columbia projects at 0001 hours on April 10, 2016 and will run through August 31, 2016.  The 2016 Fish Operations Plan calls for the following spill levels at the Federal Lower Columbia River Projects.

Project

Spring Spill

(April 10- June 15)

Summer Spill

(June 16-August 31)

Day / Night Spill

Day / Night Spill

McNary

40% / 40%

50% / 50%

John Day

30% / 30% and

40% / 40%

30% / 30% and

40% / 40%

The Dalles

40% / 40%

40% / 40%

Bonneville

100 Kcfs / 100 Kcfs

95 Kcfs/95 Kcfs vs. 85 Kcfs/121 Kcfs (June 16-July 4) 95 Kcfs/95 Kcfs (July 5-August 31)

Estimation of FOP Spill:

All projects have a minimum powerhouse flow requirement. The table below provides the range of minimum powerhouse requirements for each project, followed by the assumed minimum for the graphs (in parentheses).  The assumed minimum requirements include project specific miscellaneous flows (e.g., adult fishways).

Project

Minimum Powerhouse Flow (kcfs)

Lower Granite

11.8-12.2 (12)

Little Goose

11.3-11.8 (11.5)

Lower Monumental

10.8-12.3 (12)

Ice Harbor

8.4-10.3 (10.5 Mar-Jul, 10 Aug)

McNary

50-60 (55)

John Day

50-60 (51.2)

The Dalles

50-60 (56)

Bonneville

30-40 (42)

At low flows the FOP spill amounts cannot always be provided along with minimum powerhouse flows (PH Min). In this instance all estimates of FOP Spill (i.e., red line on graphs) are adjusted for assumed project specific powerhouse minimum requirements using the following criteria:

If Total Flow > Court Order + PH Min ' Court Order = Court Order
If Total Flow < Court Order + PH Min ' Court Order = Total Flow - PH Min.

12-hr Avg TDG:

Oregon and Washington have different methodologies when estimating the 12-hr average TDG.  For Oregon, the 12-hr average is based on the 12 highest hourly TDG measurements in a single calendar day (not necessarily consecutive).  For Washington, the 12-hour average is based on rolling 12-hr rolling averages.  The highest of the rolling averages is what is reported as the 12-hr average for a given day.  The location of a TDG monitor and/or type of monitor will dictate which of these methodologies is used for compliance monitoring.  Below is a table of which methodology of methodologies are being used for each monitor. 

TDG Monitor

12-hr Average TDG Methodology Used

Lower Granite Tailrace

Washington

Little Goose Forebay

Washington

Little Goose Tailrace

Washington

Lower Monumental Forebay

Washington

Lower Monumental Tailrace

Washington

Ice Harbor Forebay

Washington

Ice Harbor Tailrace

Washington

McNary Forebay

Washington

McNary Tailrace

Greater of Washington and Oregon

John Day Forebay

Washington

John Day Tailrace

Greater of Washington and Oregon

The Dalles Forebay

Washington

The Dalles Tailrace

Greater of Washington and Oregon

Bonneville Forebay

Washington

Bonneville Tailrace (CCIW)

Greater of Washington and Oregon

 

**Spill to the Gas Cap:

In the FOP, spill to the gas cap means to spill a volume of water that achieves the total dissolved gas (TDG) waivers, specifically, the 120% tailrace TDG criteria, and the downstream forebay 115% TDG criteria. To assess whether the FOP is being implemented, spill should be evaluated relative to whether the 120% TDG is being met in the tailrace, and/or the 115% is being achieved at the next downstream forebay. Both TDG levels are plotted on the graph for each project.

The US Army Corps of Engineers (COE) develops daily levels of maximum spill that the COE estimates will not exceed the TDG criteria. These estimated "spill caps" are given to the project operators as maximum spill levels. The estimated "spill caps" presented in the graphs are taken directly from the TMT website (http://www.nwd-wc.usace.army.mil/tmt/documents/ops/spill/caps/).  However, updates of the estimated “spill caps” are not always available and, thus, the FPC graphs may lag several days. The COE's assessment of meeting the Court Order is dependent on whether a project spills to the estimated "spill caps".

IHR:
Spring and summer spill at IHR will alternate between two different levels of FOP Spill (30%/30% versus 45 kcfs/Gas Cap).  Prior to April 28, spill at IHR will be 45 Kcfs/Gas Cap.  From April 28 to July 13, the two spill levels will be alternated in 2 day blocks. After July 13, spill at IHR will be 45 Kcfs/Gas Cap

JDA:
From April 27 to approximately July 20, spill at JDA will alternate between two different levels of FOP Spill (30%/30% and 40%/40%). During this time, spill levels will alternate in 4-day blocks. Prior to April 27 and after July 20, spill at JDA will be 30%/30%.

Note: Spill at some projects varies relative to flow, therefore the scale of Y-axes may be different for each project and may change from week to week at an individual project.

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