Timber Island Road over Postun Bayou

Map

Coordinates:
+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]`

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

Date	Condition	Deck	Superstructure	Substructure	ADT	Suff. Rating
November 2017	Fair	Satisfactory	Satisfactory	Satisfactory	133	64.8
November 2015	Fair	Satisfactory	Satisfactory	Satisfactory	133	64.4
November 2013	Fair	Satisfactory	Satisfactory	Satisfactory	133	64.4
November 2012	Fair	Good	Good	Satisfactory	121	64.6
November 2011	Fair	Good	Good	Satisfactory	121	64.6
November 2010	Fair	Good	Good	Satisfactory	121	64.6
December 2009	Good	Good	Good	Good	121	64.6
January 2009	Good	Good	Good	Good	121	63.6
February 2008	Good	Good	Good	Good	121	63.6
March 2007	Good	Good	Good	Good	121	63.6
May 2005	Good	Good	Good	Good	121	48.6
June 2004	Good	Good	Good	Good	121	49.9
July 2003	Good	Good	Good	Good	121	51.1
July 2002	Good	Good	Good	Good	121	51.3
August 2001	Good	Good	Good	Good	121	51.3
August 2000	Good	Good	Good	Good	121	59.9
October 1999	Good	Good	Good	Good	121	59.9
October 1998	Good	Good	Good	Good	121	59.9
September 1997	Good	Good	Good	Good	121	59.7
September 1996	Good	Good	Good	Good	121	60.7
October 1995	Good	Good	Good	Good	121	55.4
October 1994	Good	Good	Good	Good	121	57.4
October 1993	Good	Good	Good	Good	121	55.4
October 1992	Good	Good	Good	Good	121	55.4
November 1991	Good	Good	Very Good	Good	121	55.4