Promontory Route Railroad Trestles, Trestle 791B, 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: tie plated; 4th stringer replaced, 4 struts bulkhead to bulkhead added, 2 ties replaced, 2 piles in each up- stream wing of bulkheads added. 8. Comments: The and Bridge Inspection Books1 describe this trestle as an open deck structure which is 16 feet long and 8 feet high (to bottom of rail). It has four 16-inch stringers and four-pile bents which are untreat- ed.

The stringers are shown as "bad" and needing "renew[al]N in They were apparently replaced in from information shown in a common stand- ard plan (CS A fourth stringer was replaced in Four struts were added from bulkhead to bulkhead in and two ties replaced in Two piles in each upstream bulkhead wing were added sometime between and The structure was cited in good condition in i PROMONTORY ROUTE RAILROAD TRESTLES, TRESTLE 79IB (TRESTLE HAER No. UT-64-G (page 2) PART II. ARCHITECTURAL INFORMATION This structure is a small single span wooden framed trestle measuring 17 feet 2 inches long and 7 feet 4 inches from water to bottom of rail. It has two four-post bents upon which rest large cap beams. There are two pairs of 8-by-16-inch stringers set on end directly under each rail location.

Ties are laid on top of these stringers. Two 9-inch Chevron gasoline pipelines run the length of the trestle on each side of the deck. They rest on the ends of the cap beams. Tiie use of four- post bents suggests that only "light loading" (use of E-45 locomotives) of the ire..!e was proposed.2 The bulkheads consist of or 12-inch boards stacked on edge and held up by the bents under the deck and by 10-by-12-inch and 8-by-10-inch posts on the bulkhead wings. The northeast and northwest north bulkhead wings also have pilings which were added in recent years to help hold back the bank; two on each wing. The wings are flared about 45 degrees. An additional structural note on the bulkheads is that two 10-inch beams have been added under the deck wedged between the bulkheads to help hold them up.

This feature was not noted on any other trestle structure. Similar to UT-64-F, a remnant sawed off circular juniper post was found between the existing bents on this trestle. Others were probably there, but were obscured by water and ice. No doubt, these are remnants of the original trestle structure built in The one visible post measured 12 inches in diameter. As noted at UT-64-E, cut nails were found in several bulkhead wing wall posts. 1. Southern Pacific Transportation Company, Salt Lake Division, Bridge Inspection Books and On file at the Southern Pacific Transportation Company, San Francisco, California. 2. Walter Loring Webb, Railroad Construction, Theory and Practice, New York: John Wiley & Sons, Inc., p. PROMONTORY ROUTE RAILROAD TRESTLES, TRESTLE (TRESTLE HAER No.

UT-64-G (page 3)