Bridge and Culvert Inventory Markers

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Bridge and Culvert Inventory Markers are signs that identify bridges and culverts for jurisdictional maintenance purposes and occasionally to assist the travelling public. Oregon has placed inventory markers on bridges since around the year 2000, but some counties and cities have used them in decades prior.

State Highways

Bridge Inventory Markers

XXXX

Culvert Markers

XXXX

County Roads

Not all counties place inventory markers on their bridges or at their culverts.

Mp-county-clatsop-bridge-examples.png

Clatsop County

XXXX


Mp-county-linn-bridge.png

Linn County

Linn County places inventory markers on its bridges that displays information like road number, milepoint, bridge number, road name and body of water crossed. These usually appear on both sides of the bridge and use some form of Helvetica for the typeface.

  • A bridge inventory marker at MP 1.16 on Hofer Road, 2016

  • A bridge inventory marker at MP 0.15 on Higbee Road, 2016


Mp-county-tillamook-bridge.png

Tillamook County

Tillamook County places blue inventory markers on bridges it maintains which list the bridge name, the county bridge number (including the county road number in the first segment), the ODOT bridge number, and the body of water being crossed. All text on the markers is in FHWA Series B. While it isn't known at this time when these markers were placed, their reflective background suggests they may have been placed around the same time as the newer reflective mileposts used on county roads since around 2015.

  • A bridge inventory marker for the Cronin Creek Bridge on Foss Road, 2021

  • A bridge inventory marker for the Salmonberry Bridge over the Salmonberry River on Foss Road, 2021

  • A bridge inventory marker for the CCC Bridge over the Nehalem River on Foss Road, 2021


Mp-county-washington-bridge-culvert.png

Washington County

Washington County marks most of its bridges and culverts with markers similar to county road identifiers on mileposts, with the word "ROAD" replaced with "BRIDGE" or "CULVERT" appropriately. The numerals are larger than the road markers, and the legend text appears to be less condensed. Numerals are in Series B, C or D. No other mileage or route identification information can be found on these markers. A newer version of this marker was placed on the Scholls Ferry Road bridge over the Tualatin River when it was replaced in 2008.

  • A Washington County bridge marker on Cochran Road near Reehers Camp, 2019


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