Salmon Decision Process

1. Salmon Decision Process • Procedure for adaptively managing Chinook Salmon in the Delta • Specific criteria for physical and biological monitoring developed from 1995-2002 • Basis for decision on DCC gate closures and use of (b)(2) and EWA for export reductions • Primarily focused on juvenile Chinook Salmon

2. 1 Tributary Juvenile Migration Status 2 3 Fry/Pre-Smolt < 70 mm length range Smolt / yearling 70 mm - 150 mm length range 4 5 50% Increase in tributaryaverage daily flow Observed at mouth of tributaries No Action 6 FIRST ALERT 7 20% Increase Sacramento River Flow at Wilkins Slough 8 SECOND ALERT 10 Water Quality Criteria Jersey Point < 1.8 Bethel Island < 1.0 Holland Tract < 0.8 Tide Cycle Weather Conditions Export Magnitude 9 Knights Landing Catch Index of “older juveniles” (KLCI) and/or Sacramento Catch Index (SCI) ** Leave DCC Open CI < 3 11 Elevate Recommendations to WOMT for Decision Fail WQ criteria 3 < CI < 5 Consider Closing DCC 5 < CI <10 Meet WQ criteria Close DCC for 4 Days within 24 hrs CI > 10 Close DCC until < 5.0 fish THIRD ALERT Proceed to Chart 2 2001/2002 Chinook decision process October through March (Chart 1 of 2).

3. 12 KLCI “older juveniles” or SCI > 10 Oct - Feb and > 15 Mar 13 Initiate 10-day export/survival test of 4,000 cfs total export if Sac. Flow increase of 20% at Wilkins Sl. is expected to continue for at least 7 days THIRD ALERT Compare winter-run Chinook loss, delta smelt 14-day mean and monthly salvage, and steelhead cumulative salvage to take levels of concern Monitor Chinook loss at SWP and CVP Delta Exports 14 14 14 Daily SWP/CVP loss density “older juveniles” < 8/taf and CNFH CWT LFR cumulative loss < .5% Daily SWP/CVP loss density “older juveniles” > 8/taf or CNHF CWT LFR cumulative loss  .5% Daily SWP/CVP loss density “older juveniles” > 15 FOURTH ALERT FIFTH ALERT Elevate Recommendations to WOMT for Decision 16 15 Insufficient EWA and/ or b(2) assets Sufficient EWA and/ or b(2) assets Reduce exports to 6,000 cfs at SWP or 3,000 cfs at CVP for 3 days, depending on source of greatest loss Reduce exports to 4,000 cfs at SWP or 2,000 cfs at CVP for 3 days, depending on source of greatest loss 2001/2002 Chinook decision process October through March (Chart 2 of 2).

6. Figure 1

7. Figure 2

8. Figure 3

9. Figure 4

10. Figure 5

11. Figure 6

12. Figure 7

13. Figure 8