+18.21333, -66.34000
18°12'48" N, 66°20'24" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:PR 770 over UNKNOWN CREEK
Structure number:008871
Purpose:Carries highway over waterway
Route classification:Local (Rural) [09]
Length of largest span:11.2 ft. [3.4 m]
Total length:24.0 ft. [7.3 m]
Skew angle:28°
Owner:State Highway Agency [01]
Year built:1970
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Number of main spans:2
Main spans material:Concrete [1]
Main spans design:Culvert [19]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Bituminous [6]

Latest Available Inspection: June 2017

Good/Fair/Poor Condition:Good
Status:Open, no restriction [A]
Average daily traffic:2,000 [as of 2005]
Truck traffic:2% of total traffic
Structural appraisal:Better than present minimum criteria [7]
Water adequacy appraisal:Meets minimum tolerable limits to be left in place as is [4]
Roadway alignment appraisal:Basically intolerable requiring high priority of corrrective action [3]
Channel protection:Bank is beginning to slump. River control devices and embankment protection have widespread minor damage. There is minor stream bed movement evident. Debris is restricting the channel slightly. [6]
Pier/abutment protection:Navigation protection not required [1]
Culvert condition:Shrinkage cracks, light scaling and insignificant spalling which does not expose reinforcing steel. Insignificant damage caused by drift with no misalignment and not requiring corrective action. Some minor scouring has occured near curtain walls, wingwalls or pipes. Metal culverts have a smooth symmetrical curvature with superficial corrosion and no pitting. [7]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Sufficiency rating:89.9
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$53,000

Previous Inspections

DateConditionCulvert ConditionADTSuff. Rating
June 2017Good7 out of 10200089.9
May 2015Good7 out of 10200089.9
June 2013Good7 out of 10200089.9
July 2011Good7 out of 10200089.9
July 2009Good7 out of 10200090.9
October 2007Good7 out of 10200090.9
December 2005Good7 out of 1090071.1
March 2003Good7 out of 1090071.1
November 2000Good7 out of 1090068.1
October 1998Good7 out of 1090071.1
August 1996Good7 out of 1090071.1
August 1994Good7 out of 1090075.1
August 1992Fair6 out of 10180073.5
February 1991Fair6 out of 10172073.5

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
Reinforced Concrete Culvertlinear ft.6255700
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.52421000