CA ERFO KLAMATH NF 17N11(1) Upper Doolittle & Mill Creek Bridges

THIS IS NOT A REQUEST FOR BID – PLANS AND SPECIFICATIONS ARE NOT AVAILABLE.

THIS WILL BE ADVERTISED AS A HUBZONE SET-ASIDE.

PROJECT NUMBER:  CA ERFO KLAMATH NF 17N11(1)

PROJECT NAME:   UPPER DOOLITTLE & MILL CREEK BRIDGES

PROJECT DESCRIPTION:  The Klamath National Forest (KNF) sustained significant damage to transportation facilities, including bridges during the 2020 fire season. The US Forest Service (FS) is requesting that the Central Federal Lands Highway Division (CFLHD) perform engineering and construction services to replace the Upper Doolittle and Mill Creek Bridge structures utilizing Emergency Repair for Federally Owned Roads (ERFO) funds.

The Upper Doolittle Creek Bridge is located approximately 5.9 miles Northwest of Happy Camp on Forest Route 17N11 within Klamath National Forest in Siskiyou County, CA. 

The Mill Creek Bridge is located approximately 15.3 miles Northwest of Happy Camp on Forest Route 18N15 within Klamath National Forest in Siskiyou County, CA.

Upper Doolittle Existing bridge information:

• Single span structure 41’ long with clear width 14.1’. 
• On tangent with no skew. 
• Bridge is single lane bridge built in 1966. 
• Bridge designed to H20 design vehicle load.  Not posted prior to fire.
• Superstructure is timber glulam girders, deck panels, and railings.  No approach railing.  Object markers at ends.
• Substructure abutments and wingwalls are timber pile and lagging walls with tiebacks.  Bottom of wall approximately 17’ below profile grade. Rock bearing not noted on plans.

Mill Creek Existing bridge information:

• Single span structure 40’ long with clear width 20.25’. 
• Bridge is on a horizontal curve alignment of radius 100’ but constructed on tangent chord with no skew. 
• Bridge is extra wide single lane bridge, most likely to accommodate turning movements of vehicles along sharp curve. 
• Bridge built in 1981. 
• Bridge designed to HS20 design vehicle load.  Bridge not posted prior to fire.

SCOPE OF THE WORK: The purpose of this project is to fully replace both the Upper Doolittle and Mill Creek Bridges. 

Upper Doolittle Proposed Scope/information:

• A 70-ft x 16-ft proposed structure is anticipated for Doolittle Creek.
• Prefabricated steel bridge with rolled girders, structural steel decking and asphalt fill. 
• Structural depth would be approximately 36” deep.
• All structural steel girders, diaphragms, and railing components on bridge would be weathering steel. Steel thrie-beam bridge railing.

Mill Creek Proposed Scope/information:

• A 60-ft x 28-ft proposed structure is anticipated for Mill Creek.
• Prefabricated steel bridge with rolled girders, structural steel decking and asphalt fill. 
• Structural depth would be approximately 36” deep.
• All structural steel girders, diaphragms, and railing components on bridge would be weathering steel. Steel thrie-beam bridge railing.

The roadway approaches will be reconstructed for up to 150 feet on either end of the bridges. The bridges and short sections of the roadway approaches will be asphalt overlaid to reduce sedimentation into the streams. Bridge rail and guardrail with terminals will be included.

Items worth noting:

• Both existing structures have been completely removed and the timber stacked on site. The FHWA contract will include disposal of the material.
• The work will be listed within a single Schedule (Schedule A) and no options are proposed.
• Adjacent segments of the Forest Routes will remain closed during construction and can be used for contractor staging and storage. 
• Access is to both sides of the Doolittle Creek Bridge via by an approximate 8-mile detour.
• Access is to both sides of the Mill Creek Bridge via by an approximate 10-mile detour.
• Deep foundations (micro-piles or drilled shafts) are anticipated

PRINCIPAL WORK ITEMS:

Approximate quantities for major work items:

• 1 LPSM of Removal of Existing Structures and Obstructions
• 400 CUYD of Excavation/Embankment Construction         
• 1000 CUYD of Riprap
• 400 TON of Roadway Aggregate
• (1) 70-ft x 16-ft Prefabricated Steel Bridge
• (1) 60-ft x 28-ft Prefabricated Steel Bridge
• 400 TON of Asphalt Pavement                     
• 300 LNFT of Guardrail
• 160 hours of Equipment Hours          
• 160 hours of Labor Hours
• 500 SQYD of Turf establishment
• 1 LPSM of Temporary Traffic Control         

ANTICIPATED SCHEDULE: 

Advertisement:  February 2022

Award:  April 2022 

Construction:  May 2022 – October 2022 

ENGINEER’S ESTIMATE: 

The proposed project is estimated at a cost between $1 million and $5 million.