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Siphon Bridge

Siphon Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: June 25, 2011 and October 23, 2012

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Key Facts

Facility Carried / Feature Intersected
M-94 (Deer Street) Over Manistique River
Manistique: Schoolcraft County, Michigan: United States
Structure Type
Concrete Continuous Slab, Fixed and Approach Spans: Concrete T-Beam, Fixed
Construction Date and Builder / Engineer
1918 By Builder/Contractor: Manistique Pulp and Paper Company of Manistique, Michigan

Technical Facts

Rehabilitation Date
Main Span Length
44 Feet (13.4 Meters)
Structure Length
296 Feet (90.2 Meters)
Roadway Width
42 Feet (12.8 Meters)
5 Main Span(s) and 3 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This bridge crosses the Manistique River, as well as the Manistique River flume which is like a concrete river channel that is positioned higher than the actual river to allow water to flow at a higher elevation from a dam upstream. This flume was a solution to a paper mill's need for more water for its mill. A dam there would have been unacceptable since it would have flooded the town. The portion of the bridge that crossed over the flume was specially designed with thick, tall railings similar to those used by the state highway department for through girders. In this case however, the railings actually protected the roadway from water, which originally flowed at a level higher than the roadway itself. This unusual function is no longer visible, since the mill had lowered the water level below that of the roadway in recent years.

Paul Walker of the Schoolcraft County Historical Society reported that as of 2013, Manistique Papers remains in business and is owned by Future-Mark Papers. Currently the mill has been hiring and doing quite well giving the difficulty of the paper industry. Governor Snyder and State Senator Tom Casperson and a local bank, M-Bank are very much credited for saving the Paper Mill utilizing assets from the Michigan Economic Development Corporation to back up loans until the mill was sold and emerged from bankruptcy.

The portion of the bridge itself which crosses over the actual river rather than the flume appears to have been extensively reconstructed, and may have a loss of historic integrity.

Information and Findings From Michigan Historic Bridge Inventory

Narrative Description

This eight-span girder bridge is 296 feet long overall and is an unusual design in that the bridge is an integral part of a concrete raceway flume. Since the water level in the flume is actually above the level of the roadway, the bridge acts as a siphon, thus its nickname, Siphon Bridge.


Photo Galleries and Videos: Siphon Bridge

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Maps and Links: Siphon Bridge

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