Description
- CTDOT is responsible for a complex drainage system including storm drains, manholes, closed conveyance pipes, culverts, headwalls, and endwalls.
- Culverts convey watercourses or stormwater runoff underneath state roads. In Connecticut, the majority of culverts are reinforced concrete pipes (RCPs) or corrugated metal pipes (CMPs). CMPs can have asphalt coating.
- Culverts with a diameter of 6' and larger are considered bridge structures and are inspected and tracked as bridges. Culverts smaller than 6' in diameter (<72" horizontal dimension for box culverts) are considered drainage culverts.
State of Good
Repair (SOGR)
A culvert which has been rated Fair or Good is classified as being in a State of Good Repair (SOGR). This rating is based on the Culvert Condition Rating Assessment developed by the CTDOT Office of Environmental Planning.
Asset Age
The average drainage culvert in the CTDOT network is 68 years old. The average drainage CMP in the CTDOT network is 61 years old.
Description
- CTDOT is responsible for a complex drainage system including storm drains, manholes, closed conveyance pipes, culverts, headwalls, and endwalls.
- Culverts convey watercourses or stormwater runoff underneath state roads. In Connecticut, the majority of culverts are reinforced concrete pipes (RCPs) or corrugated metal pipes (CMPs). CMPs can have asphalt coating.
- Culverts with a diameter of 6' and larger are considered bridge structures and are inspected and tracked as bridges. Culverts smaller than 6' in diameter (<72" horizontal dimension for box culverts) are considered drainage culverts.
State of Good
Repair (SOGR)
A culvert which has been rated Fair or Good is classified as being in a State of Good Repair (SOGR). This rating is based on the Culvert Condition Rating Assessment developed by the CTDOT Office of Environmental Planning.
Asset Age
The average drainage culvert in the CTDOT network is 68 years old. The average drainage CMP in the CTDOT network is 61 years old.
Description
- CTDOT is responsible for a complex drainage system including storm drains, manholes, closed conveyance pipes, culverts, headwalls, and endwalls.
- Culverts convey watercourses or stormwater runoff underneath state roads. In Connecticut, the majority of culverts are reinforced concrete pipes (RCPs) or corrugated metal pipes (CMPs). CMPs can have asphalt coating.
- Culverts with a diameter of 6' and larger are considered bridge structures and are inspected and tracked as bridges. Culverts smaller than 6' in diameter (<72" horizontal dimension for box culverts) are considered drainage culverts.
State of Good
Repair (SOGR)
A culvert which has been rated Fair or Good is classified as being in a State of Good Repair (SOGR). This rating is based on the Culvert Condition Rating Assessment developed by the CTDOT Office of Environmental Planning.
Asset Age
The average drainage culvert in the CTDOT network is 62 years old. The average drainage CMP in the CTDOT network is 59 years old.
Drainage Culvert Inventory and Condition
In this chart:
- Note: Percentages of culverts in Good/Fair/Poor condition are based on the number of assessed culverts
- Based on CTDOT 12/31/23 Snapshot
Inspected Culvert Inventory and Condition by Material
In this chart:
- Note: Percentages of culverts in Good/Fair/Poor condition are based on the number of assessed culverts
- Based on CTDOT 12/31/23 Snapshot
History
In this chart:
- Based on funding as of 12/31/23
Drainage Culvert Inventory and Condition
In this chart:
- Note: Percentages of culverts in Good/Fair/Poor condition are based on the number of assessed culverts
- Based on CTDOT 1/10/23 Snapshot
Inspected Culvert Inventory and Condition by Material
In this chart:
- Note: Percentages of culverts in Good/Fair/Poor condition are based on the number of assessed culverts
- Based on CTDOT 1/10/23 Snapshot
History
In this chart:
- Based on CTDOT 1/10/23 Snapshot
Drainage Culvert Inventory and Condition
In this chart:
- Based on CTDOT 12/31/21 Snapshot
Inspected Culvert Inventory and Condition by Material
In this chart:
- Based on CTDOT 12/31/21 Snapshot
History
In this chart:
- Based on CTDOT 12/31/21 Snapshot
Performance Projections
Culvert performance projections were created using very limited data from culverts that had both age and condition data associated with them. Due to the longevity of drainage culverts, 10 years of projections does not fully capture the financial needs of this asset.
Asset Valuation
$1,814,365,747
Asset value is estimated using the replacement value. For 13,058 estimated culverts, replacement value is 13,058 * $138,947 = $1,814,365,747
Measures & Goals
There are no Federal requirements for drainage culverts at this time. CTDOT has set the following state goal:
- 80% of retaining walls in a SOGR
Performance Projections
Culvert performance projections were created using very limited data from culverts that had both age and condition data associated with them.
Asset Valuation
$1,597,886,820
Asset value is estimated using the replacement value. For 11,500 estimated culverts, replacement value is 11,500 * 276 sq ft of pipe * $503 per sq ft of pipe = $1,597,886,820
Measures & Goals
There are no Federal requirements for drainage culverts at this time. CTDOT has set the following state goal:
- 80% of retaining walls in a SOGR
Performance Projections
Culvert performance projections were created using very limited data from culverts that had both age and condition data associated with them.
Asset Valuation
$2,708,657,000
Asset value is estimated using the replacement value. For 20,235 estimated culverts, replacement value is 20,235 * 276 sq ft of pipe * $485 per sq ft of pipe = $2,708,657,100
Measures & Goals
There are no Federal requirements for drainage culverts at this time. CTDOT has set the following state goal:
- 80% of retaining walls in a SOGR
Drainage Culvert Performance Projections
In this chart:
- NOTE: "Current Funding" shown in the graphs is limited to funding programed to address State of Good Repair. Projected performance is expected to be greater due to asset improvements funded through CTDOT's Capital Program which are not captured. The Department will soon be able to capture this funding through a project asset data system in development.
- Based on funding as of 12/31/23
Drainage Culvert Performance Projections
In this chart:
- NOTE: "Current Funding" shown in the graphs is limited to funding programed to address State of Good Repair. Projected performance is expected to be greater due to asset improvements funded through CTDOT's Capital Program which are not captured. The Department will soon be able to capture this funding through a project asset data system in development.
- Based on funding as of 12/31/22
Drainage Culvert Performance Projections
In this chart:
- Based on funding as of 12/31/21