US 36 Bridges at St. Vrain and Left Hand Creek

Project Facts

  • Budget: $10 million to $20 million

Project Team

  • Contractor: American Civil Constructors


From Monday, Sept. 18 to Wednesday, Sept. 27, crews will pave US 36 from 4100 Ute Highway (Clark's TrueValue Hardware Store) to Park Street (Lyons Quilting). Crews will work in the westbound lanes, moving from east to west, and will return in the eastbound lanes.

The project is slated for completion in summer 2018.


Crews will replace the 62-year-old culvert at US 36 and Left Hand Creek with a wider bridge that spans the creek—allowing a 100-year flood event to pass under the highway. They also will restore Left Hand Creek to a natural, resilient state, in coordination with other restoration efforts east and west of US 36.

Bridge features will include:

  • 6- to 8-foot shoulders;
  • two, 12-foot travel lanes;
  • a northbound left-turn lane to Middle Fork Drive; and
  • a southbound right-turn/deceleration lane to Middle Fork Drive.

In the Town of Lyons, work includes protection efforts against scour—or erosion—on three bridges, and minor drainage improvements.

Traffic Impacts

  • Normal work hours: 8:30 a.m. – 3:30 p.m. Monday through Friday
  • Traffic will be reduced to one lane during paving.
  • A 25 mph speed limit will be strictly enforced within the mile-long workzone during this two-week window.

Damage Overview

This section of US 36 is one of the main corridors providing access between Estes Park and Boulder crossing both the St. Vrain Creek and Left Hand Creek.  Floodwaters caused extensive damage to these channels as well as the structures along US 36. Damage included large amounts of debris an sediment deposit, erosion of the roadway embankment, overtopping of the roadway, scour damage of the bridge piers and abutments, and exposing underground utilities. 



One of the goals in the repair process is to introduce certain betterments to roadway facilities that were damaged and make them more resilient to similar storm events in the future.  Having analyzed the damage caused during the flood event, certain design elements will be incorporated in an effort to prevent or lessen the severe damage that significant flood events can cause.  The permanent repair phase will allow for the betterment of drainage facilities and erosion protection areas throughout the corridor that can handle the high flows from large storm events and protect facilities from potential damage in the future.

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