SAFETY
Uneven surfaces including stair treads
Operating Machinery: Keep hands on hand rails, pockets, or your camera.
Event of an injury needing EMS response →Greg or Adam will contact the ACOE control room.
First aid on every level, AED outside the control room.
Fire/flooding Evacuate to the 285’ deck
McNARY DAM
Construction 1947-1954 Powerhouse construction 1954-1957
1.4 mile long (7365ft) gravity, run of the river, dam. 183ft tall. 292 miles from the mouth of Columbia.
Creates Lake Wallula – 1,350,000 Acre-ft of water. Extends 64 miles behind the dam.
22 Spillway Gates
14 turbines – 1127MW capacity – Black start facility.
NAVIGATION LOCK
75ft drop.
86ft wide X 683ft long
Time to fill/drain.10-15 minutes.
Note: When the Bascule Bridge is raised, there is no vehicle or personnel access to or from the spillway deck.
FISH LADDER
1 foot drop per weir
Two holes in weir to allow fish passage, won’t see many fish over the weir.
Ladder is designed to have a low flow to provide eddy current – low stress
Fish ladder attraction water is added at the entrance of the ladder to help fish enter the ladder.
About 90% of the ladder water is from attraction.
Ladder flow ~ 200cfs
Attraction flow ~ 1600cfs (fills a 3-bedroom house in about 8 seconds)
FISH LIFT
We previously used an elevator to raise the fish above the dam.
Now used as the By-Pass structure – When the unit is off line, the attraction flow is provided via by-pass to ensure fish ladder criteria is maintained.
PROJECT OPERATION
We provide fish ladder attraction water to the McNary Washington fish ladder.
This additional flow helps the upstream migrating fish to find the hole in the dam to enter the fish ladder. Once in the ladder the fish pass the attraction water and swim in a reduced flow area of the ladder. The design of the ladder allows fish to rest within a section without being washed down to the bottom.
Fish ladder has historically operated 11 months out of the year. This allows us to use the attraction water to generate electricity during most of the year.
VALVE ROOM
Hydraulic Supply for Intake/Bypass gate operation.
Break room
Supply storage.
CONTROL ROOM - 273
480VAC distribution
Ventilation and fire panels
Unit control Auto/Manual
GEN FLOOR - 261
13.8KV distribution
Station service transformer 13.8→480 (house load)
Exciter – Provides the DC voltage to make the field on the rotor thru slip rings and brushes
High lift pump – Provides lubrication for a friction free startup
Generator Air housing
CO2 Fire suppression system
TURBINE FLOOR - 247
Station service battery
Wicket gate HPU
Station service air compressor
Safety shower
Turbine pit
SUMP - 218
Scroll case, Draft tube access
Sump for all plant drainage
