Promontory Route Railroad Trestles, Trestle 790C, 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 con- structed 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: stringers replaced, caps replaced, 3 ties replaced, 8. Comments: The and Bridge Inspection Books1 describe this trestle differently. Both describe it as an open deck structure measuring 10 feet long and 7 feet high and having four-pile bents which are untreated. The book notes that it has three 7-by-16-inch stringers. The book, however describes them as three 8-by-17-inch stringers. In an unknown number of stringers were replaced; in cap beams were replaced; and in three ties were tie plated. It was considered in good condition in i PROMONTORY ROUTE RAILROAD TRESTLES, TRESTLE (TRESTLE HAER No. UT-64-F (page 2) PART II.

ARCHITECTURAL INFORMATION This is a short wooden framed single span trestle measuring 11 feet 8 inches long and 6 feet 2 inches high (from water to bottom of rail). The trestle has four-post bents upon which rest large cap beams. Two pairs of stringers, in turn, rest on those cap beams and form the support for the ties. The use of four-post bents suggests that only "light-loading" (use of E-45 locomotives) of the trestle was proposed.2 The bulkhead construction consists of to 12-inch boards stacked on edge and held back by the bents under the deck and by 12-inch posts on the wings. The wings are oriented at a 45 degree angle. On top of the wing walls are 6-by-12-inch beams laid flat and sloping away from the trestle, presumably to reduce erosion of the bank behind the wing walls.

Original juniper (cedar) pilings from the first trestle structure built here were visi- ble adjacent to the current structure bents. They are closer together than the cur- rent bents and consist of unmilled circular posts with bark still attached which have been sawed off near the water line. They average about 11 inches in diameter. On the west face of the easternmost post on the south bent there is a number carved. The number, "798A", was first thought to be the trestle structure number. A check with the maintenance records showed this to be in error. 1. Southern Pacific Transportation Company, Salt Lake Division, Bridge Inspection Books and On file at the Southern Pacific Transportation Company, San Francisco, California. 2.

Wilter Loring Webb, Railroad Construction, Theory and Practice, New York: John Wiley & Sons, Inc., p. PROMONTORY ROUTE RAILROAD TRESTLES, TRESTLE (TRESTLE HAER No. UT-64-F (page 3) Location ofTrestle Taken from: USGS Public Shooting Grounds, Utah Quadrangle