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 

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]
Evaluation:Structurally deficient [1]
Sufficiency rating:40.0

Previous Inspections 

DateSuff. ratingEvaluationDeckSuper.Sub.ADT
December 201640.0Structurally deficientPoorPoorSerious1000
November 201540.0Structurally deficientPoorPoorSerious1000
November 201455.1Structurally deficientPoorPoorPoor1000
October 201355.1Structurally deficientPoorPoorPoor1000
November 201253.1Structurally deficientCriticalPoorPoor1000
February 201238.0Structurally deficientCriticalPoorSerious1000
February 201138.0Structurally deficientSeriousPoorSerious1000
March 200938.0Structurally deficientSeriousPoorSerious1000
March 200739.8Structurally deficientFairFairPoor500
June 200440.9Structurally deficientVery GoodPoorFair500
August 200235.8Structurally deficientCriticalCriticalPoor500
June 200047.9Structurally deficientSeriousSeriousFair500
May 199847.9Structurally deficientSeriousSeriousFair500
October 199635.8Structurally deficientSeriousSeriousFair500
April 199441.1Structurally deficientSeriousPoorFair500
November 199241.1Structurally deficientSeriousPoorFair500
February 199057.2Not deficientFairFairFair500