Bonneville 1

Ice Harbor

Lower Monumental

Little Goose

Adult

Juvenile

1. Fish ladder at north end of powerhouse and on each end of the spillway.

3. Powerhouse auxiliary water attraction and collection system.

1. Small bypass channel at the south end of powerhouse and at ends of spillway included in initial construction.

1. 41 of the 65 original PH collection system entrances closed.

3. Upstream ladder reconstructed from overflow adjustable weirs to vertical slot baffle configuration.

1. Juvenile fish egress orifices drilled from each turbine gate-slot to existing ice/trash sluiceway.

2. Ice/trash sluiceway gates opened. Juvenile fish from gatewells and forebay passed around south end of powerhouse.

O&M improvements to PH collection gates and collection system water quality.

1. STS put into each turbine intake. 12" orifices drilled from gatewell to bypass channel placed in sluiceway, evaluation facilities constructed at north end of powerhouse.

2. PIE’s * improvements put into place: Gatewell debris removal system, modified bypass downwell/pipe

1. In 1998 gates were taken out of entrances 1, 2, 64 &65 to provide 8 feet of opening.

4. Adult fish fallback studies initiated

1. Juvenile fish monitoring/evaluation facilities added. Prototype surface bypass installed for testing. Prototype extended screens installed for testing.

4. Surface bypass studies initiated.

Adult

Juvenile

North ladder, PH collection system with entrance tunnels and north/south main entrances (and joined spillway entrance), Fish sampling facility. Vertical slot Counting station. Auxiliary water supply by two fish water turbines.

Turbine draft tube designed to improve flows for adult fish approaching power house collection system

N/A

1. Stream-lined turbine intake trashracks, lowered screens, Intake extensions, modified separation/dewatering structures.

1. Debris and sand removed from fish ladder diffuser chambers. Diffuser chamber and grating upgraded with heavier material.

2. Adult PIT tag evaluation

4. Survival studies

Adult

Juvenile

Fish-lock located beside east ladder

No juvenile facilities included in original design/construction.

Maintenance and repairs. Fish lock no longer used. No major modifications to existing system.

2. Ice/trash sluiceway gates opened to skim and pass juvenile fish around powerhouse

2. Counting station modifications.

1. Spill-for-Fish initiated (30-40% and 64% of flow). Used to augment sluiceway skimming.

3. Gatewell debris removal system

Emergency auxiliary water supply and dewatering system options being studied and implemented.

2. Surface spill, RSW’s, sluiceway under testing/consideration.

Adult

Juvenile

North/South fish ladders, pumped auxiliary water system, powerhouse collection system and spillway channel entrances.

Orifices (6") in each intake gatewell to a bypass pipe leading to a tailrace release point.

2. Collection system floating gate entrances closed.

No configuration modifications. Spill for fish program began in 1979.

None

2. Reservoir drawdown studies initiated.

3. Ringold mitigation studies and implementation.

6. Project survival studies.

Adult

Juvenile

North and south fish ladders, pumped auxiliary water supply system, powerhouse collection system with orifices and channel openings and a fish lock.

Pipe openings on each side of the south shore fish ladder exit. Adult fish ladder/lock auxiliary water fed through pipes to attract juvenile fish.

1. Collection system, ladder entrances modified for higher tailwater.

2. Vertical slot counting stations installed.

1. In mid-60’s, sluiceway converted into bypass route with 6" orifices into each gateslot (as per Ice Harbor)

3. Spillway deflectors on 18/22 bays

Replaced auxiliary water pump transformers.

1. Transport facility reconstruction (new bypass channel, separation, evaluation facilities, holding and loading facility, and outfall).

2. Gate-raise and gantry crane modifications.

1. Installed adult fish PIT) tag detection systems in both ladders in 2002.

1. Extended Bar screens installed in lieu of STS’s, replacement VBS’s (including later modifications to ESBS’S).

4. Future Removable Spillway Weir work under consideration.

Adult

Juvenile

1. Fish ladders on north and south sides of river including a Powerhouse auxiliary water attraction and collection system

No powerhouse juvenile bypass included in initial construction

1. Ladders modified to include non-overflow section on ladder weirs.

3. Flashboard counting stations replaced with vertical slot crowders and windows

1. Six inch juvenile fish egress orifices drilled from each turbine gate-slot to existing ice/trash sluiceway.

2. Ice/trash sluiceway used to pass juvenile fish around powerhouse

1. Bulkheads installed

2. Spare pump equipment added to auxiliary water system

1 Ice/trash sluiceway gates opened and automated for juvenile fish entry from forebay.

3. Initiated screened bypass construction.

1. Auxiliary water supply system modifications (scheduled for completion in 2003).

2. Adult PIT tag detection systems

3. Surface collection and spillway testing.

2. Powerhouse auxiliary water attraction and collection system

Orifices (6") from each turbine gate-slot to an imbedded pipe juvenile bypass.

1. S. Ladder Flashboard counting station replaced with vertical slot crowder and window.

1. No juvenile bypass modifications.

2. Spill deflectors on bays 2-7

2. Purchased spare pump equipment, and rebuilt auxiliary water turbine.

1. STS in each turbine intake, 12" orifices drilled from gatewell to newly mined bypass channel, transport, facilities and PIT tag detectors.

2. Operating gates raised and gantry crane modified to handle STS’s.

2. Adult PIT Tagging facility design/construction planned (schedule dependent upon budget).

3. Spill deflectors installed on the two remaining bays.

adult

juvenile

South shore ladder with gravity and pump auxiliary water supply. PH collection system with orifices and gates. North shore entrance with channel leading across spillway to PH collection channel. Vertical slot counting station

Orifices (6") from each turbine gate-slot to an imbedded pipe juvenile bypass.

Maintenance and repairs as needed; No major modifications to system

New bypass system completed in 1980 with STS’s, 12" gatewell orifices (some equipped with 8" inserts and orifice plates) leading to channel, pressurized pipe leading to transport holding and loading facilities.

1.PIES actions included rebuilding auxiliary water turbines, upgrading fishway controls, rerouting surplus juvenile bypass water to adult collection system.

5. New transport facilities and flume installed.

2. Auxiliary water supply system improvements

5. Trash shear boom

South shore ladder with gravity and pump auxiliary water supply. PH collection system with orifices and gates. North shore entrance with channel leading across spillway to PH collection channel. Vertical slot counting station. Adult fish trap in south ladder

A full STS bypass system with a separate fish screen slot in each turbine intake, two 8" orifices from each fish screen and bulkhead slot leading to a mined channel, a pressurized bypass pipe leading to transport holding and loading facilities.

$1.8M

Corrected problem with fish pump gearboxes.

Maintenance and repairs as needed; No major modifications to system

2. New STS’s and VBS’s in 1981 and transport facility improvements (additional raceways, etc.) in 1982.

$3.2M

Upgraded fishway controls. Other maintenance and repairs as needed; no major modifications to system

5. New juvenile outfall pipe.

$10.0M

1. Adult fish trap rebuilt

4. Picketed leads placed in PH collection system channel to reduce adult fish falling back to tailrace.

4. Removable spillway weir installed June 2001; operational testing in 2002 and 2003.

$95.4M