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S-20 (Sea Mountain Highway) Bridge

Bridge No: 2670002000100

Asset ID: 686

County: Horry

Bridge Name: Little River Bridge

Facility Carried: S-26-20

Feature Intersected: Intercoastal Waterway

Year Built: 1935

Year Reconstructed:

Main Structure Type: Swing Span

Design:

Main Material: Steel

Railing Type:

Number of Main Spans: 1

Number of Approach Spans: 1

Approach Type: T Beam, reinforced concrete

Structure Length: 264feet

Structure Width: 27.6 feet

Setting:

Bridge Description

The bridge consists of a 217'-long, center-bearing swing span with thru truss superstructure and a 47'-long T beam approach span.The operator’s house remains in its overhead position above the roadway.There is not much information in the bridge inspection file.The rest pier was "under construction" in Aug. 2005.

Significance

The swing span bridge was determined eligible by the SHPO as a result of the Horry County Survey, 1988-89.The swing span bridge is the one of the three oldest of seven identified swing span highway bridges dating from 1929 to 1960 in the inventory.Although a relatively late example of a technology that was developed nationally in the late 19th century, it appears to be one of the few remaining complete examples in SC of the inherently complex movable bridge technology.There was not enough information in the bridge inspection file (no photos) to make a thorough assessment of the effect of any alterations on integrity since the 1989 eligibility decision.

The bridge underwent a rehabilitation project in 2002, which included minor structural, mechanical, and electrical system replacements and updates, as well as the replacement of the existing control house with a pre-engineered octagonal control house. Consultation with the State Historic Preservation Office (SHPO) determined that replacement of the control house would have no adverse effect on the historic bridge, as the existing control house, was determined to be a later date than the bridge itself and to have already undergone alterations, did not contribute to the significance of the bridge structure.