Deficient Bridges
Overview
Yamhill County has 133 bridges under its maintenance jurisdiction. Of these, 46 bridges have been appriaised as being deficient by the Oregon Department of Transportation and in need of repair or replacement.
What is a Defeicient Bridge?
The Oregon Department of Transportation inventories bridges in Yamhill County and assigns one of the following categories:
- NON-DEFICIENT - Inspections show that the bridge can safely carry the load and traffic it was designed to handle.
- STRUCTURALLY DEFICIENT - The bridge is closed because of structural inadequacy, restricted to light vehicles (load-posted) because it can no longer carry the weight it was designed to handle, or is in immediate need of rehabilitation to stay open.
- FUNCTIONALLY OBSOLETE - The bridge is structurally sound but it is no longer adequate for the road it is on and for the traffic it serves. This category includes bridges that are load-posted because the original design no longer meets the criteria for the highway system for deck geometry, clearance, or roadway alignment.
The American Association of State Highway and Transportation Officials (AASHTO) Sufficiency Rating Formula defines the method for describing bridge condition. The sufficiency designation is important because a bridge must be declared deficient and should have a sufficiency rating of 80 or less to qualify for federal funding. This rating is one criteria used to establish priorities for bridge replacement or rehabilitation and as a guide to generally identify bridges that need improvements. The lower the rating, the higher the priority. Bridges rated from 100-80 are considered non-deficient; 80-50 generally require rehabilitation; below 50 need replaced or rehabilitated. Structurally deficient bridges are rated for deck, superstructure, substructure, culvert, retaining wall, structural condition and waterway adequacy. Functionally obsolete bridges are rated for deck geometry, underclearance, approach roadway alignment, structural condition and waterway adequacy. If a bridge is both structurally deficient and functionally obsolete, it is classified only as structurally deficient.
List of Bridges Rehabilitated or Replaced- Updated 2/26/2009
Willamina Creek Rd
Willamina Creek
Old Number: 01751A
New Number: 20088
Replaced with new bridge
Rex Brown Rd
Panther Creek
Old Number: 11605
New Number: 19880
Replaced with new bridge
Baker Creek Rd
Baker Creek
Old Number: 11540A
New Number: 20065
Replaced with new bridge
Tindle Creek Rd
Willamina Creek
Old Number: 11774C
New Number: 19161
Replaced with new bridge
Lafayette Hwy
Yamhill River
Old Number: 11493A
New Number: 20351
Replaced with new bridge
Westside Rd
Baker Creek
#11640A
Rehabilitated
Meadowlake Rd
N. Yamhill River
Old Number: 11566
New Number: 20066
Replaced with new bridge
Moores Valley Rd....(Mistakenly named Westside Road)
Baker Creek
Old Number: 11645
New Number: 20329
Replaced with new bride
