Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:31ST STREET N.W. over C&O CANAL
Structure number:0003
Purpose:Carries highway and pedestrian walkway over waterway
Route classification:Local (Urban) [19]
Length of largest span:20.0 ft. [6.1 m]
Total length:39.7 ft. [12.1 m]
Roadway width between curbs:33.1 ft. [10.1 m]
Deck width edge-to-edge:48.6 ft. [14.8 m]
Vertical clearance below bridge:9.8 ft. [3.0 m]
Owner:State Highway Agency [01]
Year reconstructed:1929
Historic significance:Bridge is eligible for the National Register of Historic Places [2]
Number of main spans:2
Main spans material:Steel [3]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Integral Concrete (separate non-modified layer of concrete added to structural deck) [2]

Latest Available Inspection: December 2016

Good/Fair/Poor Condition:Poor
Status:Posted for load [P]
Average daily traffic:1,000 [as of 2007]
Truck traffic:1% of total traffic
Deck condition:Poor [4 out of 9]
Superstructure condition:Poor [4 out of 9]
Substructure condition:Serious [3 out of 9]
Structural appraisal:Basically intolerable requiring high priority of corrrective action [3]
Deck geometry appraisal:Equal to present minimum criteria [6]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present desirable criteria [8]
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:In place and functioning [2]
Scour condition:Bridge foundations (including piles) on dry land well above flood water elevations. [9]
Operating rating:38.9 tons [35.4 metric tons]
Inventory rating:23.0 tons [20.9 metric tons]
Sufficiency rating:40.0

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
December 201640.0PoorPoorPoorSeriousSD1000
November 201540.0PoorPoorPoorSeriousSD1000
November 201455.1PoorPoorPoorPoorSD1000
October 201355.1PoorPoorPoorPoorSD1000
November 201253.1PoorCriticalPoorPoorSD1000
February 201238.0PoorCriticalPoorSeriousSD1000
February 201138.0PoorSeriousPoorSeriousSD1000
March 200938.0PoorSeriousPoorSeriousSD1000
March 200739.8PoorFairFairPoorSD500
June 200440.9PoorVery GoodPoorFairSD500
August 200235.8PoorCriticalCriticalPoorSD500
June 200047.9PoorSeriousSeriousFairSD500
May 199847.9PoorSeriousSeriousFairSD500
October 199635.8PoorSeriousSeriousFairSD500
April 199441.1PoorSeriousPoorFairSD500
November 199241.1PoorSeriousPoorFairSD500
February 199057.2FairFairFairFair-500

Element Data

Source: National Bridge Elements dataset, 2016 edition. This feature is experimental.
ElementUnitsQuantity1. Good2. Fair3. Poor4. Serious
Steel Girder/Beamlinear ft.800118060280
Steel Protective Coatingsq. ft.1,280812001,152
Reinforced Concrete Decksq. ft.1,934001,9340
Wearing Surfacessq. ft.1,2061,08181440
Steel Columneach50032
Steel Protective Coatingsq. ft.150000150
Masonry Abutmentlinear ft.102465600
Steel Pier Caplinear ft.5104290
Steel Protective Coatingsq. ft.102000102
Reinforced Concrete Pier Caplinear ft.5143440
Pourable Jointlinear ft.4000040
Movable Bearingeach3680262
Steel Protective Coatingsq. ft.50005
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.80063170
Steel Protective Coatingsq. ft.456045042