CO NP ROMO 407(1) Holzwarth Culvert
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Description & Project Overview
CO NP ROMO 407(1) Holzwarth Culvert
Solicitation id: 6982af27b000004
project number: co ftnp romo 407(1)
project name: holzwarth culvert
project description:
this project will replace the deficient holzwarth culvert (structure no. 1520-029s), a six-barrel corrugated metal arch pipe culvert on the holzwarth access road with a steel girder bridge. located in rocky mountain national park, approximately nine miles north of grand lake, co, along us hwy 34 at an elevation of 8,900 feet, the culvert conveys flow from the colorado river and provides access to the holzwarth historic site. the purpose of this project is to prevent future roadway damage and flooding while maintaining access to employee housing, the historic site, and national park service and forest service recreation opportunities.
scope of the work:
the project will consist of removal of the existing six barrel culvert and construction of a new steel girder bridge with a cast in place concrete deck. new bridge abutments and micropiles. temporary stream diversion and riprap. new aggregate roadway surfacing. relocation of an existing electrical line. relocation of existing historic head gates into a new concrete slab. the site is accessible on foot a quarter mile past the locked gate at the south end of the holzwarth historic site parking lot and along the holzwarth culvert access road. the holzwarth culvert access road is approximately 13’ wide with tight turns. temporary widening will be necessary to prevent truck off tracking on to sensitive environmental resources. a temporary truck turnaround will also be necessary as no construction access is allowed more than 100’ west of the bridge.
principal work items:
20304-2000 removal of bridge: 1 each
30202-2000 roadway aggregate, method 2: 120 ton
55504-0000 prefabricated steel bridge (10’ wide x 48’ long modular steel vehicular bridge): 1 lpsm
56701-0000 micropile (8.68” dia.): 180 lnft
62801-0000 temporary stream diversion: 1 lpsm
anticipated schedule:
advertisement – september 2026
award – december 2026
ntp – december 2026
contract completion – november 2027
estimated cost range:
total estimated cost between $700,000 and $2,000,000.
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