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Section 3: Other Relevant Information

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National Bridge Inventory (NBI) Number

The NBI number is a 15-digit number that uniquely identifies each bridge and contains information about the location of the bridge, the route carried, and the facility crossed. The last three digits of the NBI number make up the permanent structure number (PSN). The significance of other digits that make up the NBI number is described below.

On-system numbers. NBI numbers for on-system bridges are developed from the following information: a two-digit district number, a three-digit county number, a zero, a four-digit control number, a two-digit section number, and the three-digit permanent structure number. The zero is a placeholder required for national inventory purposes. A typical NBI number is 14-150-0-0289-07-026.

Each new, replaced, rehabilitated, or widened bridge structure will have a unique NBI number and must have separate bid items. The Bridge Division’s internal Project Development web page has instructions on the proper use of the Bridge Cost Information (BCI) Screen in DCIS.

A new permanent structure number (PSN) is assigned when a new structure is being constructed or an existing structure is being replaced. Bridges that are being widened or rehabilitated retain their PSNs. Contact the Bridge Division’s Inspection Branch to obtain new PSNs for new construction or when an existing bridge is being replaced.

When two or more bridges (generally box culverts) are widened such that they combine to form one bridge, contact the Bridge Division’s Inspection Branch to obtain the PSN that will be assigned to the combined bridge.

Off-system numbers. NBI numbers for off-system structure numbers are developed from the following information: a two-digit district number, a three-digit county number, a zero, a four-digit control number, a two-digit section number, and a three-digit unique bridge number. For new off-system bridge locations, contact the Transportation Planning and Programming Division (TPP) by email at with location information to receive the off-system county road (or city street) control and section.

For existing off-system bridge replacements, use the control and section identification numbers of the existing bridge.Off-system bridges that are being replaced receive a new unique number. The District assigns and maintains the structure ID number for off-system bridges.

For a new or replaced off-system bridge, the unique ID number should be the next available sequence numeral with regard to all bridges located within the limits of the control section under review.

For off-system bridges, notify the Bridge Division’s Inspection Branch so that pertinent information regarding structure type, completion date, etc., can be updated in the Bridge Inspection Database. If the local entity replaces the bridge, then the Bridge Inspection Database should be updated and the bridge should be removed from the off-system Highway Bridge Program prioritization. Notification and updates to the Bridge Inspection Database are essential.

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Guidelines for P3B Screen Entry

Existing NBIs must be entered on the P3B screen in DCIS. Federal funds expended on the project may not be reimbursed to TxDOT if the correct existing and/or old NBI numbers are not entered. The following information is required on the P3B screen for all bridge projects.

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  • National Bridge Inventory (NBI) number. Include the existing NBI for Replacement projects.Type of bridge work (removal, replace, widen, rehabilitation, and maintenance or repair)

More detailed information about how to enter this data is located on the BRG Project Development web page at http://crossroads/org/brg/PD/index.htm.

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