Promontory Route Railroad Trestles, Tresle 789B, 11 miles west of Corrine, Corinne

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This trestle is one of many remaining Promontory Route railroad trestles which were originally part of the first transcontinental railroad route across the United States. These trestles represent a class of small utilitarian wooden trestles constructed throughout the country during the latter half of the century. PART I. HISTORICAL INFORMATION 1. Date of construction: 2. Railroad Structural Designation: (at milepost 3. Architect: Central Pacific Railroad Company 4. Original and subsequent owners: Central Pacific Railroad Company, Southern Pacific Transportation Company, 1884-present 5. Builders, contractors, suppliers: Central Pacific Railroad Company 6. Original plans and construction: Unknown 7. Alterations and additions: Deck replaced, ties replaced, 8.

The and Bridge Inspection Books1 describe this trestle as an open deck structure which is 13 feet long with a height of 6 feet from water to the bottom of rail. The discrepancy between this height and that measured by the author may be due to heavy silting under the trestle. It is shown to have three 7-by-16-inch stringers and four-pile bents of redwood. A new deck was in- stalled in and ties were replaced in In the trestle was consid- ered in good condition. i PROMONTORY ROUTE RAILROAD TRESTLES, TRESLTE (TRESTLE HAER No. UT-64-B (page 2) PART II. ARCHITECTURAL INFORMATION This is a very small single span wooden framed trestle. It is 13 feet 2 inches long and lies 3 feet 7 inches high from water level to the bottom of rail (top of the ties).

It is supported by two four-post bents which barely rise above the water level to support the 12-by-12-inch cap timbers. Two pairs of inch stringers sup- port the deck. The use of only four-post bents suggests that only "light loading" (use of E-45 locomotives) of the trestle was needed.2 The bulkheads on the south side of the trestle are obscured with heavy grass cover, but those on the north side are angled at about 45 degrees and consist of inch boards supported by 12-inch squared timbers. Two 9-inch diameter Chevron gasoline pipes, running the length of the trestle, rest on the cap beams on the lower edge of each side of the deck. 1.

Southern Pacific Transportation Company, Salt Lake Division, Bridge Inspection Books and On file at the Southern Pacific Transportation Company, San Francisco, California. 2. >tolter Loring Webb, Railroad Construction, Theory and Practice, New York: John Wiley & Sons, Inc., p. PROMONTORY ROUTE RAILROAD TRESTLES, TRESLTE (TRESTLE HAER No. UT-64-B (page 3) Location of Trestle Taken from: USGS Public Shooting Grounds, Utah Quadrangle