McNary Master Plan

Supporting Data

Item 5
Pertinent Data


General
River Mile292
Drainage area, square miles214,000
Normal hydraulic height, feet75
Maximum structural height, feet220
Overall length at crest, feet7,300
Discharge, cfs:
Minimum of record
Mean annual
Maximum of record (1894)
Spillway design flood
30,000
191,000
1,150,000
2,200,000
First power on lineDecember 1953
Concrete, cubic yards1,861,000
Earth, cubic yards2,937,000

Estimated Cost
1 January 1977 $304,700,000

Lake
Elevations:
Maximum
Normal operating range
356.5
340-335
Length, miles61.6
Area at normal pool, acres37,000
Relocations, miles:
Railroad
State highway and county roads
Power and communications lines
80.5
42.5
57
Drawdown for power, feet5
Capacity, power pondage, acre-feet185,000
Revetted levees, miles17
Length of shoreline, miles242

Navigation Lock
TypeSingle lift
Normal lift, feet75
Clear width, feet86
Net clear length, feet683
Minimum depth over sills, feet15
Upstream gateMiter
Downstream gateArch
Guide wall lengths, feet:
Upstream
Downstream
1,417
1,520

Spillway
Deck elevation361
Crest elevation291
Overall length, feet1,310
Control gates:
Number
Type
Size, width by height above crest, feet
22
Vertical lift
50' x 51'
Maximum design capacity, cfs2,200,000
Deck cranes, each, 2, capacity, tons200

Powerhouse
Number of units14
Nameplate rating, kilowatts:
Each
Total
70,000
980,000
Intake deck elevation361
Tailrace deck elevation287
Unit spacing, feet86
Length assembly bay, feet134
Length overall, feet1,422
Turbines:
Type
Runner diameter, inches
Revolutions per minute
Horsepower rating
Kaplan
280
85.7
95,400
Crane capacities, tons:
Intake deck
Bridge, powerhouse interior, each, 2
Tailrace deck
140
350
30

Abutments
AbutmentsRock fill with impervious core

Fish Facilities
Number of ladders2
Ladder slopes1 on 20
Ladder widths, feet30


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