Timber Island Road over Postun Bayou


+29.84352, -84.67137
29°50'37" N, 84°40'17" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:Timber Island Road over Postun Bayou
Structure number:490002
Location:0.5 Mi East of US98/SR30
Purpose:Carries highway over waterway
Route classification:Local (Rural) [09]
Length of largest span:29.9 ft. [9.1 m]
Total length:270.0 ft. [82.3 m]
Roadway width between curbs:24.0 ft. [7.3 m]
Deck width edge-to-edge:30.2 ft. [9.2 m]
Owner:County Highway Agency [02]
Year built:1962
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18 / HS 20 [5]
Number of main spans:9
Main spans material:Concrete [1]
Main spans design:Slab [01]
Deck type:Concrete Cast-in-Place [1]

Latest Available Inspection: November 2017

Good/Fair/Poor Condition:Fair
Status:Posted for load [P]
Average daily traffic:133 [as of 2017]
Truck traffic:3% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Satisfactory [6 out of 9]
Substructure condition:Satisfactory [6 out of 9]
Structural appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck geometry appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Water adequacy appraisal:Superior to present desirable criteria [9]
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 the assessed or calculated scour condition. [8]
Sufficiency rating:64.8

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
November 2017FairSatisfactorySatisfactorySatisfactory13364.8
November 2015FairSatisfactorySatisfactorySatisfactory13364.4
November 2013FairSatisfactorySatisfactorySatisfactory13364.4
November 2012FairGoodGoodSatisfactory12164.6
November 2011FairGoodGoodSatisfactory12164.6
November 2010FairGoodGoodSatisfactory12164.6
December 2009GoodGoodGoodGood12164.6
January 2009GoodGoodGoodGood12163.6
February 2008GoodGoodGoodGood12163.6
March 2007GoodGoodGoodGood12163.6
May 2005GoodGoodGoodGood12148.6
June 2004GoodGoodGoodGood12149.9
July 2003GoodGoodGoodGood12151.1
July 2002GoodGoodGoodGood12151.3
August 2001GoodGoodGoodGood12151.3
August 2000GoodGoodGoodGood12159.9
October 1999GoodGoodGoodGood12159.9
October 1998GoodGoodGoodGood12159.9
September 1997GoodGoodGoodGood12159.7
September 1996GoodGoodGoodGood12160.7
October 1995GoodGoodGoodGood12155.4
October 1994GoodGoodGoodGood12157.4
October 1993GoodGoodGoodGood12155.4
October 1992GoodGoodGoodGood12155.4
November 1991GoodGoodVery GoodGood12155.4