AESI designed this 0.6-mile urban reconstruction project through Boulder, Montana, for the Montana Department of Transportation (MDT). This project involved extensive landscaping in medians, accommodating large truck movements, decorative sidewalks, on-street parking, water line adjustments, new storm drain system, out fall and detention pond, and ADA ramps to existing buildings.
AESI provided hydrologic/hydraulic analysis and design for the Main Street storm drain system containing over 3000 feet of storm drain. AESI also designed a 2500-foot storm outfall line and settling pond. Additionally, a number of stormwater/irrigation crossings involving complex flow splits and headwater limitations were designed.
The Town of Boulder had difficult storm drainage issues resulting from runoff generated from drainage basins located northwest of town. Development including the highway had altered and in some cases dammed natural drainage paths which are quite subtle through town. MDT design criteria for the re-constructed road required storm drainage conveyance across the highway without overtopping for the 50-year flow event. In order to address the local runoff as well as the offsite runoff, AESI designed a Main Street storm drainage system containing over 3000 feet of storm drainage pipe. A 2,500 foot long storm drainage outfall line was required to route the stormwater through town to the nearest natural drainage.
AESI’s transportation team produced excellent designs for this project, and the Boulder Project won an award for context sensitive design.