MAP-21 Performance Measures

Before viewing the MAP-21 Performance Measures widgets, it is important to understand some of the terminology and how the widgets work.

Good/Fair/Poor Scale

The rating system of Good, Fair, and Poor that is used in several of the widgets is in reference to the NBI condition rating values and is based on a scale of 0-9. AssetWise Inspections’ ratings are as follows:

9-7 = Good
6-5 = Fair
4-0 = Poor

For bridges, this rating is determined by the minimum value of NBI items 58, 59, and 60. For culverts, this rating is determine by the minimum value of NBI item 62.

Count vs. Area

Some widgets are based on counts while others are based on area. This can give two similar widgets very different results.

Example:

Bridge A: 1000 feet of deck area in Good condition. Bridge B: 2000 feet of deck area in Poor condition.

The Bridge Condition widget is count based, therefore it’s only interested in one count of a bridge’s rating. Bridge A is in Good condition and Bridge B is in Poor condition. Each only counts as 1, despite Bridge B being twice as large, so the result is a 50/50 pie graph:

The Deck Area Bridge Condition widget is area based, therefore it takes into account the amount of a bridge’s deck area with a certain rating. Bridge A has 1000 feet of deck area in Good condition and Bridge B has 2000 feet of deck area in Poor condition. The total deck area of 3000 feet is considered, so the result is a 66/33 pie graph:

Knowing the difference between count-based and area-based will make reading and understanding the widgets much easier.

Bridge Condition by Deck Area All Bridges – displays the percentage of Deck Area bridges in Good, Fair, and Poor condition. This is an area-based widget. Only assets that meet the requirements for FHWA reporting will be factored into the pie graph.
Bridge Condition by Deck Area NHS Bridges – displays the percentage of Deck Area NHS bridges in Good, Fair, and Poor condition. This is an area-based widget. Only NHS bridges within the assets selected when adding the widget will factor into the pie graph.
Bridge Condition All Bridges – displays the percentage of bridges in Good, Fair, and Poor condition. This is a count-based widget. Only assets that meet the requirements for FHWA reporting will be factored into the pie graph.
Bridge Condition NHS Bridges – displays the percentage of NHS bridges in Good, Fair, and Poor condition. This is a count-based widget. Only NHS bridges within the assets selected when adding the widget will factor into the pie graph.
Bridge Status All Bridges – displays the number of bridges with each Bridge Status: OK/SD/FO. This is a count-based widget. Only assets that meet the requirements for FHWA reporting will be factored into the pie graph.
Bridge Sufficiency Rating by Deck Area All Bridges – displays the percentage of Deck Area per Bridge Sufficiency Rating decile. This is an area-based widget. Only assets that meet the requirements for FHWA reporting will be factored into the pie graph.
NBI 58 Deck Condition Ratings – displays the number of bridges with each of the NBI 58 Deck Condition ratings. This is a count-based widget. Only assets that meet the requirements for FHWA reporting will be factored into the pie graph.
NBI 59 Superstructure Condition Ratings – displays the number of bridges with each of the NBI 59 Superstructure Condition ratings. This is a count-based widget. Only assets that meet the requirements for FHWA reporting will be factored into the pie graph.
NBI 60 Substructure Condition Ratings – displays the number of bridges with each of the NBI 60 Substructure Condition ratings. This is a count-based widget. Only assets that meet the requirements for FHWA reporting will be factored into the pie graph.
NBI 62 Culvert Condition Ratings – displays the number of bridges with each of the NBI 62 Culvert Condition ratings. This is a count-based widget. Only assets that meet the requirements for FHWA reporting will be factored into the pie graph.
Posted Bridges – displays the count of Open, Closed, and Posted bridges. This is a count-based widget. Only assets that meet the requirements for FHWA reporting will be factored into the pie graph.
Structurally Deficient Bridges by Deck Area All Bridges – displays the percentage of deck area on Structurally Deficient bridges. This is an area-based widget. Only assets that meet the requirements for FHWA reporting will be factored into the gauge.
Structurally Deficient Bridges by Deck Area NHS Bridges – displays the percentage of deck area on Structurally Deficient NHS bridges. This is an area-based widget. Only NHS bridges within the assets selected when adding the widget will factor into the gauge.