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TLN - MNDOT Guidebook - Research Report Enhanced Culvert Inspections Best Practices

  • Dec 8, 2017 (10:00 - 11:30 am Central Time) – Webinar

Course Description

Part 1 of an 8-Part Webinar Series on Roadway/Street Pipes

Review of MnDOT’s Enhanced Culvert Inspections and Best Practices Guidebook by the author, Doug Youngblood. Culvert inspection is a key enabler that allows transportation departments to manage a state-wide highway culvert system. When quantitative detail on culvert condition is required, an inspector will need to use enhanced inspection technologies. Enhanced inspection technologies such as laser ring profiling, sonar, inclinometer, mandrel, hammer sound testing, core sampling, closed circuit television (CCTV) and remote vehicle inspecting (HIVE), can measure or digitally record condition that would not be apparent from a simple visual inspection. In general, an organization should balance the higher cost of conducting an enhanced inspection against the quality of data needed. It is estimated that simple end-of-pipe visual inspection costs $0.07/ft. Enhanced inspections range from $0.23/ft. to $6.50/ft. with higher cost inspections providing more detailed data. Estimates are developed using year 2016 unit costs. Best practices for each type of inspection are identified and presented in this guidance document. In addition, practical and logistic considerations are identified to assist staff in selecting cost-effective inspection methods for typical types of inspection. Types of inspection include: design-related, post-construction, condition and emergency/complaint-related inspection. Recommendations are presented to improve an organizations enhanced inspection program.


Doug Youngblood is an Environmental Engineer for CDM Smith in the Greater Minneapolis–St Paul area. Doug’s focus areas include project engineering and management for a variety of water treatment, wastewater treatment, pipe conveyance, asset management, rehabilitation and program management projects. He has extensive field experience inspecting pipes per the NASSCO Pipe Assessment Certification Program (PACP) standards and has leveraged this experience to develop a best practices guidebook for MnDOT. Doug has a Bachelor of Science in civil engineering and master’s degree in environmental engineering technology from the University of Nebraska-Lincoln.

Target Audience

Everyone involved in the conveyance of storm water will want to take part in this webinar series. Designers, construction inspectors, maintenance workers, and contractors will benefit from this eight-week series - Pipe Inspections; CMP; HDPE/PP; PVC; RCP; Liners part 1; Liners part 2, and Jacking/Boring.


REGISTRATION DEADLINE: Tuesday, December 6, 2017

More Info

The above resource and more can be accessed by visiting the TLN Learning Management System (LMS).

515 ½ E BroadwaySuite 101Bismarck, ND 58501