SR 20 over TWISP R


+48.36717, -120.12247
48°22'02" N, 120°07'21" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:SR 20 over TWISP R
Structure number:0015714A0000000
Location:38.8 E CHELAN CO
Purpose:Carries highway and pedestrian walkway over waterway
Route classification:Minor Arterial (Rural) [06]
Length of largest span:191.0 ft. [58.2 m]
Total length:198.2 ft. [60.4 m]
Roadway width between curbs:35.4 ft. [10.8 m]
Deck width edge-to-edge:45.3 ft. [13.8 m]
Owner:State Highway Agency [01]
Year built:2000
Historic significance:Historical significance is not determinable at this time [4]
Main span material:Prestressed concrete [5]
Main span design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Monolithic Concrete (concurrently placed with structural deck) [1]

Latest Available Inspection: July 2017

Good/Fair/Poor Condition:Good
Status:Open, no restriction [A]
Average daily traffic:4,033 [as of 2012]
Truck traffic:14% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Very Good [8 out of 9]
Structural appraisal:Better than present minimum criteria [7]
Deck geometry appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]
Scour condition:Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Sufficiency rating:86.5
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$3,564,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
July 2017GoodGoodGoodVery Good403386.5
July 2015GoodGoodGoodVery Good403386.5
July 2013GoodGoodGoodVery Good394486.6
July 2011GoodGoodGoodVery Good394486.6
July 2009GoodGoodGoodVery Good389986.7
August 2007GoodGoodGoodVery Good400086.6
July 2005GoodGoodGoodVery Good400086.6
August 2003GoodVery GoodVery GoodVery Good400088.6
August 2001GoodVery GoodVery GoodVery Good400086.5
October 2000GoodVery GoodVery GoodVery Good390095.1