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DateDaily Comments
8/24/2009 12:00:00 AM"Court Order: 75 kcfs/Gas Cap; 24-hr Avg Spill = 67.8 kcfs (Spill below 75 Kcfs at times due to low flows and powerhouse minimums); Cascade Island (12-hr Avg TDG = 113.0%) - TDG waiver not exceeded; Camas-Washougal (12-hr Avg TDG = 114.3%) - Not a point of compliance for TDG waiver"
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Spill Season Update

 


 

In accordance with the Court Order, spill was initiated at the Snake River Projects at 0001 hours on April 3, 2009. The Court Order 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 Court Order, spill was initiated at the Lower Columbia projects at 0001 hours on April 10, 2009. The Court Order calls for the following spill levels at the Federal Lower Columbia River Projects:

Project Spring Spill (April 10- June 30) Summer Spill (July 1 - August 31)
Day / Night Spill Day / Night Spill
McNary 40% / 40% 50% / 50% (beginning June 20, 2009)
John Day 30% / 30% vs. 40% / 40% study 30% / 30% vs. 40% / 40% study
The Dalles 40% / 40% 40% / 40%
Bonneville 100 Kcfs / 100 Kcfs

85 Kcfs / Gas Cap (June 21 - July 21) 75 Kcfs / Gas Cap (July 21 - August 31)

Court Order Spill:

All projects have a minimum powerhouse flow requirement:

Project Minimum Powerhouse Flow (kcfs)
Lower Granite 12
Little Goose 11.5
Lower Monumental 11.5
Ice Harbor 9.5 (Mar-Jul), 9 (Aug-Nov)
McNary 50
John Day 50
The Dalles 50
Bonneville 30

At low flows the Court Ordered spill amounts cannot always be provided along with minimum powerhouse flows (PH Min). In this instance all estimates of Court Order Spill (i.e., red line on graphs) are adjusted for 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:

The 12-hr average TDG levels that are presented in the graphs above are according to the Oregon method of calculation. This method of caluclation estimates the 12-hr average TDG based on the 12 highest hourly TDG readings in a 24 hour period. These 12 highest hours are not necessarily consecutive.

Spill to the Gas Cap:

In the Court Order, 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 Court Order is being implemented the spill should be evaluated relative to whether the 120% TDG is being met in the tailrace, and 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. The "spill caps" estimated by the COE are given to the project operators as maximum spill levels. The "spill caps" presented in the graphs are taken directly from the COE. These "spill caps" are updated by the COE every two weeks so the graphs may lag several days. The COE's assessment of meeting the Court Order is dependent on whether a project spills to the "spill caps".

IHR:
IHR is conducting spill tests under two different levels of Court Order Spill (30%/30% versus 45 kcfs/Gas Cap). This test will begin on April 28th and is expected to run through mid-July. These different spill levels will be tested in 2 day blocks.

MCN:
MCN will no longer be testing differnt spill levels in summer 2009. Instead, beginning June 20th, MCN will spill a constant 50% of instantaneous flow through the entire summer season.

JDA:
JDA will be testing two levels of Court Order spill in 2009, beginning April 27th (30%/30% versus 40%/40%). This test was expected to run through the spring and summer. However, the TSW at JDA was shut down in early June and the test was put on hold until further notice. Until then, spill at JDA is expected to remain at 30% of instantaneous flows.

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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