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Collection: Directories and Documents > Pamphlets
Effects of the Truckee, California Earthquake of September 12, 1966 (PH 15-16b)(1967) (25 pages)
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Page: of 25
PERMANENT EFFECTS 7
FIGURE 6.—Southwestward view along crest toward right abutment
of Prosser Dam, Fence marks spillway near northeast end of
dam. Note that crack extends to spillway and stops. Cracks reappear beyond spillway. Left of photograph is downstream.
Scale over crack in lower right corner is 6% in. long.
FIGURE 7.—Damage to east abutment of eastbound lane bridge on
Interstate Highway 80 where it spans railroad tracks and
Truckee River at Union Mills. View to the northeast.
fill was subsiding on September 14, 1966; it was
brought to grade three times on September 13 and
at least once on September 14.
Small slumps in the railroad grade occurred
where the main line passes beneath the Interstate
Ilighway 80 bridge at Union Mills. These slumps
extended for about 200 yards but did not include
the rails.
BUILDINGS
Effects on buildings consisted chiefly of toppling
or minor damage to chimneys, cracking of plaster,
and twisting of rafter beams during swaying.
Building damage was confined chiefly to alluviated
areas and occurred as far away as Carson City (26
miles southeast of Russel Valley) and Loyalton
(18 miles north-northeast). The watermaster’s
house at Boca Dam, which was built on uncompacted fill consisting of soil and boulders, was severely
racked, whereas a nearby garage on cut ground was
undamaged. Two chimneys toppled at the roofline,
and vibration of the frame stressed the sill anchor
bolts, rending and cracking the foundation (fig.
12).
At the Feather River Lumber Co. in Loyalton, a
75by 400-ft shed, made of sheet metal on a wooden frame, oriented with its length trending about
N. 45° W., and built on alluvium, was severely
racked and tilted. Damage was so severe that the
building was deliberately collapsed.
Large boulders (8-10 ft) fell from eut slopes
along Interstate Highway 80 at several localities
just west of the California-Nevada boundary. One
boulder estimated to weigh 20 tons (Nevada State
Journal, Sept. 13, 1966, p. 7) fell from the west
cut of the freeway, skipped eastward across it, continued down the slope toward the Truckee River,
and finally punctured the masonry wall of a small
powerhouse on the west bank of the river at Farad
(fig. 13). Other boulders punctured and erushed
the large wooden flumes that service the powerhouse.
OTHER STRUCTURES
Exposed piplines to the lumber mill at Loyalton
“were ruptured and separated. Several buried pipelines were ruptured at the watermaster’s house at
Boea Dam. A power generator at the Drum powerhouse on the Bear River Canal about + miles
northeast of Auburn (about 60 miles southwest of
Russel Valley) was reported to have been out of
commission during the earthquake (Nevada State
Journal, Sept. 13, 1966, p. 7). Although ecommunications were not disrupted, there was a break in
the sheath of the transcontinental telephone cable
near the Little Truckee River.
Miscellaneous effects
Loose objects (chiefly shelf goods) were seleectively displaced in buildings at Loyalton (18 miles
northwest of Russel Valley), Verdi (9 miles northeast), Reno (16 miles northeast), the north
shore of Lake Tahoe (15 miles south-southeast),
Carson City (26 miles southeast), and in the.