US 36 Bridges at St. Vrain and Left Hand Creek

US 36 Open in new Configuration Over Left Hand Creek

Crews have re-opened US 36 in its final configuration over Left Hand Creek. The bridge, the work in the creek and other drainage improvements have been designed to create a more resilient roadway and reduce the effects of flooding and other natural disasters.

Expect small, intermittent lane closures as crews complete punchlist items.

Project Facts

  • Cost: $10 million to $20 million
  • Contractor: American Civil Constructors
September 2018
  • On July 19, crews opened the new bridge over Left Hand Creek to all traffic. Note that access to Middle Fork Road has returned to its original, pre-construction configuration.

Traffic Impacts

  • Normal work hours: 8:30 a.m. – 3:30 p.m. Monday through Friday
  • Haul trucks will be entering/exiting the work zone and will prompt short traffic holds, if any.

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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