Mason - Bear Crk Dewatto Culvert Repl.
Project Number: 2420
From milepost 6.1 to milepost 6.26
RATA Funds: $450,000
Legislative District: 35
Status:
Date Approved: 2025
This project, located at MP 6.18 on Bear Creek-Dewatto Road, proposed to replace an existing 2.5’ x 3.3’ galvanized corrugated metal squash pipe that was heavily rusted along the bottom and along the haunches. There were rust holes in the bottom of the pipe throughout the entire length. The pipe was undersized, water backed up and overtopped the road at this location during storm events, causing flooding and traffic hazards. There was an estimated two inches of coverage over the culvert and the road surface was cracked over the culvert.
The existing length of culvert and depth of cover precluded the road from being widened or the addition of shoulders. During storm events, water overtopped the road at the culvert. The existing culvert was in a sag vertical curve. This improvement addressed the vertical curve and corrects the low spot to eliminate or reduce overtopping. It also increases the hydraulic radius value, which increases flow velocity and capacity, and improves channel efficiency. The road profile was raised by an estimated 4 feet and graded, asphalt concrete pavement was added for approximately 800 feet total.
This project removed a roughly 3-foot diameter CMP and replaced it with an eleven-foot diameter aluminum pipe. The new roadbed centerline profile was raised an estimated four feet. New pavement extended 400 feet on either side of the new pipe. This increased the roadway cross section and roadway width and allowed for 2- 12 foot lanes, 2- 5 foot paved shoulders and for the installation of concrete barrier to protect traffic from the culvert ends. The new culvert is 50 feet in length. Roadside ditches on either side of the new installation were constructed to current road standards. New paved shoulders for vehicle recovery area and pedestrians were added as a traffic safety enhancement.
The existing length of culvert and depth of cover precluded the road from being widened or the addition of shoulders. During storm events, water overtopped the road at the culvert. The existing culvert was in a sag vertical curve. This improvement addressed the vertical curve and corrects the low spot to eliminate or reduce overtopping. It also increases the hydraulic radius value, which increases flow velocity and capacity, and improves channel efficiency. The road profile was raised by an estimated 4 feet and graded, asphalt concrete pavement was added for approximately 800 feet total.
This project removed a roughly 3-foot diameter CMP and replaced it with an eleven-foot diameter aluminum pipe. The new roadbed centerline profile was raised an estimated four feet. New pavement extended 400 feet on either side of the new pipe. This increased the roadway cross section and roadway width and allowed for 2- 12 foot lanes, 2- 5 foot paved shoulders and for the installation of concrete barrier to protect traffic from the culvert ends. The new culvert is 50 feet in length. Roadside ditches on either side of the new installation were constructed to current road standards. New paved shoulders for vehicle recovery area and pedestrians were added as a traffic safety enhancement.