Promontory Route Railroad Trestles, Trestle 789C, 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: cap beams installed, stringers installed, tieplated, ties replaced, 8. Comments: The and Bridge Inspection Books1 describe this trestle as an open deck structure measuring 10 feet long with three 8-by-18-inch stringers and four-pile bents of untreated wood. It is six feet high to the bottom of rail. In an unknown number of cap beams were replaced; in stringers were replaced and tie plating was done; in ties were re- placed. It was pronounced in good condition in i PROMONTORY ROUTE RAILROAD TRESLTES, TRESTLE (TRESTLE HAER No. UT-64-C (page 2) PART II. ARCHITECTURAL INFORMATION This is another very small single span wooden framed trestle. It measures 11 feet 2 inches long and is 3 feet 6 inches high from water to bottom of rail.

Similar to trestle's1 the four-post bents barely rise above the water to support the inch cap beam. The bent posts measure 10-by-12-inches in size. Two sets of two large stringers rest on the two end cap beams and they, in turn, support the ties. The use of four-post bents for support suggests that only "light-loading" (use of E- 45 locomotives) of the trestle was proposed.2 Heavy grass and water obscured parts of the low lying bulkheads, but at each end of the trestle the wings flare at about a 45 degree angle. The bulkheads beneath the deck are supported by the four-post bents and the 2-by-12-inch boards on the bulkhead wings are supported by one or more 8-by-10-inch squared posts. An interesting architectural variation occurs on these bulkhead wings.

There is a 10-inch board laid flat atop each bulkhead wall, presumably to help curb additional erosion. 1. Southern Pacific Transportation Company, Salt Lake Division, Bridge Inspection Books and On file at the Southern Pacific Transportation Company, San Francisco, California. 2. >falter Loring Webb, Railroad Construction, Theory and Practice, New York: John Wiley & Sons, Inc., p. PROMONTORY ROUTE RAILROAD TRESLTES, TRESTLE (TRESTLE HAER No. UT-64-C (page 3) Location of Trestle 7 8 9C (" C "). liken from: USGS Public Shooting Grounds, Utah Quadrangle