Highway System Condition

MassDOT Construction Workers

The System Condition section includes information on pavement and bridge condition in the Commonwealth. MassDOT maintains high quality inventory and condition data for bridges and pavements (along with other assets) in order to support full life-cycle management of transportation infrastructure.

The data is used to understand current performance, identify targets for future conditions, and inform MassDOT’s investment strategies toward a state of good repair for the Commonwealth transportation system. To learn more about asset management, see MassDOT’s Asset Management website.

Pavement Condition (PSI)

A pavement condition measure is required by MAP-21, the FAST Act, and the 2009 transportation reform bill. However, reporting requirements vary by roadway type. Here, we report Pavement Serviceability Index (PSI) on interstate and non-interstate (MassDOT-owned) pavements for the last six federal fiscal years (FFY).

PSI is a composite pavement condition index that considers the severity and extent of cracking, rutting, and raveling on surfaces as well as ride quality. It measures the conditions of the pavement from impassable to smooth. The PSI thresholds “excellent,” “good,” “fair,” and “poor” are more stringent for interstate highways to support the higher speeds and volumes present on those facilities. Interstate pavement inspections are conducted annually, and non-interstate roads are inspected on a biennial basis.

Interstate Lane Miles By Condition


In 2020, the share of interstate pavement in “good” or “excellent” condition increased by about 3 percent; as of 2020, 91.8 percent of interstate pavement was classified as “good” or “excellent” condition. The share of interstate pavement in “poor” condition dropped by .6 percent, from 2.1 percent to 1.5 percent.

Non-Interstate Lane Miles By Condition

The share of MassDOT-owned non-interstate pavement in “good” or “excellent” condition remained relatively consistent from 2014 to 2018 at an average of around 62 percent. In 2019, the share of MassDOT-owned non-interstate pavement in “good” or “excellent” condition increased to 68 percent. In 2020, it increased again to 71 percent. Over the same time period, from 2014 to 2019, the percentage of non-interstate pavement in “poor” condition decreased from 13.4 percent to 9.7 percent in 2019, with the majority of improvements coming in 2018 and 2019. In 2020, the number increased slightly to 9.8 percent.

Pavement Repair Backlog

The pavement repair includes lane miles that are in “fair” and “poor” (rather than “good” or “excellent”) condition. Out of 9,599 lane miles overseen by MassDOT, 22 percent (2,107) are on the backlog.

Bridge Condition

MassDOT currently measures bridge condition in two ways. The traditional measure is the number of bridges in poor condition within the state. The second measure is specific to National Highway System (NHS) bridges and considers the condition of the network by the area of bridges in poor or good condition. The NHS measures attribute the condition of each bridge to its size, as defined by the surface area of its deck, in order to account for the large variation in structure size across the inventory. These measures are valuable to inform capital planning, given the proportional investment required to improve structures based on their size.

A bridge is rated as poor (previously known as structurally deficient) when the deck (driving surface), the superstructure (supports immediately beneath the surface), or the substructure (foundation and supporting posts and piers) are rated at condition 4 or less on a scale of 0-9. A bridge in poor condition does not imply that a bridge is unsafe. It does, however, mean that a structure is deteriorated to the point of needing repairs to prevent restrictions on the bridge.

Count Of Bridges In Poor Condition

From FY20 to FY21, the number of bridges in poor condition remained the same, 462.

Condition By Deck Area (NHS Only)

This measure considers bridge size when calculating bridge condition and are only applied to the National Highway System. Bridges are first grouped into good or poor condition states, and then the total area of bridges within each category is compared to the total area of the inventory. For example, the traditional “count” measure assigns the same significance to the Longfellow Bridge as any other. In reality, the Longfellow Bridge is 15 times larger than an average NHS bridge in the Commonwealth.

All DOTs are required to report the percent of bridge deck area in poor condition, per the National Performance Program outlined in MAP-21. States with more than 10 percent of their total bridge deck area associated with structurally deficient NHS bridges are required to allocate a certain percentage of funds to the Highway Bridge Program until this share falls below 10 percent.

From FY14 to FY17, structurally deficient deck area was consistently 16 percent or 17 percent, but this percentage fell to 13 percent by the close of FY19, meeting the target set for 2020. In FY20 and FY21, the percentage of structurally deficient deck area remained steady at 13 percent.

Pedestrian and Bicycle Infrastructure

Pedestrian Curb Ramps

Curb ramps are a critical infrastructure component to ensure accessibility. In accordance with the MassDOT Americans with Disabilities Act (ADA) Transition Plan, MassDOT continues to reconstruct substandard curb ramps statewide. A 2012 inventory of all 26,000 curb ramps found 6,300 that were failing or missing. In FY21, the number of failed or missing curb ramps was 3,975, surpassing our 2024 target