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WEST BLACKFOOT: Transportation Improvement Projects WELCOME WELCOME West Blackfoot Transportation Improvement Projects West Bridge Street Bridge Replacement & SH-39, Thomas to Collins Siding Road (Intersection/Center Turn Lane) ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects Two projects have been identified in west Blackfoot to improve safety and accommodate growth. The City of Blackfoot, the Local Highway Technical Assistance Council (LHTAC), and the Idaho Transportation Department (ITD) have partnered to develop these improvements to: • The West Bridge Street (Collins Siding Road) Bridge • State Highway 39/Hoff Road (SH-39), between Thomas Road (S 500 W) and Collins Siding Road These projects are being done in an effort to increase safety, maximize efficiency, and provide the best options to the traveling public. OVERVIEW OF PROJECTS ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects West Bridge Street Bridge Replacement The bridge over the Snake River on West Bridge Street near SH-39 has reached its design life and is due to be replaced. The bridge, constructed in 1936, is inspected and reviewed by the ITD Bridge Inspectors annually and has been recommended for replacement. See below for some examples of bridge types being considered for this project; the primary difference being concrete vs. steel beams. Above: Example of Concrete Girder Bridge – Linder Rd. over Boise River Above: Example of Plate Steel Girder Bridge – SH-3 Bridge over St. Joe River ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects West Bridge Street Bridge Replacement The current bridge restricts the weight and dimensions of loads, requiring many detours for area industry. The project team is working to provide the best options for the community and traveling public. ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects West Bridge Street Bridge Replacement: Proposed Cross Section ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects West Bridge Street Bridge Replacement Potential construction detour route for bridge replacement: ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects SH-39, Thomas to Collins Siding Road SH-39 from approximately Thomas to Collins Siding Road (1.2 miles) will be widened with a continuous center turn lane to increase safety and capacity. When ITD designed this section of SH-39 decades ago, they planned for a future widening by purchasing adequate right-of-way. This will allow the project to proceed with very little, if any, impacts to private property. The intersection of SH-39 and Collins Siding is also seeing increased commercial and agricultural traffic volumes, requiring improvements for both safety and capacity. The traffic has been studied and alternatives for the intersection have been analyzed. Possible future impacts to the intersection resulting from the replacement of the West Bridge Street Bridge will also be considered. ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects SH-39 Segment Crash Data CRASH SEVERITY CRASH SEVERITY NUMBER OF CRASHES NUMBER OF CRASHES Fatal 0 A Injury (Incapacitating) 0 B Injury (Non-Incapacitating, Visible Injury) 6 C Injury (Possible Injury, Nonevident) 7 Property Damage Only 10 TOTAL TOTAL 23 23 *Crash History from 2015-2019 Most Harmful Event: #1 Rear-End (12 of 23 crashes) – explained by numerous driveway accesses on SH-39 without a center turn lane as a refuge to decelerate or stop to wait for a gap to turn into a driveway. Adding a center turn lane will help reduce crashes in the corridor. ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects SH-39 Widening: Typical Sections ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects SH-39/Collins Siding Rd. Intersection Crash Data CRASH SEVERITY CRASH SEVERITY NUMBER OF CRASHES NUMBER OF CRASHES Fatal 0 A Injury (Incapacitating) 0 B Injury (Non-Incapacitating, Visible Injury) 1 C Injury (Possible Injury, Nonevident) 4 Property Damage Only 14 TOTAL TOTAL 19 19 *Crash History from 2015-2019 Most Harmful Event: #1 Angle (9 of 19 crashes) – explained by several factors: • High-speed facility • Curve on SH-39 through intersection • Skew of Collins Siding Rd at intersection • SH-39 widened cross section at intersection • All factors inhibit line of sight and ability to judge gaps ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects SH-39/Collins Siding Rd. Alternative: No-Build Level of Service (LOS) 2021 Level of Service/Seconds of Delay 2048 Level of Service/Seconds of Delay D/26 E/80 F/132 F/692 A/0 A/0 A/8 A/9 A/9 A/10 SH-39 Collins Siding Rd. LEGEND: A/0 A/0 ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects SH-39/Collins Siding Rd. Alternative: Signalized Intersection/2048 LOS/Delay Left: A/9 Thru/Right: A/8 Left: A/9 Thru/Right: A/9 Left: A/13 Thru: A/9 Right: A/5 Left: A/7 Thru: A/10 Right: A/3 SH-39 Collins Siding Rd. LEGEND: Movement Level of Service/Seconds of Delay ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects SH-39/Collins Siding Rd. Alternative: Roundabout Intersection/2048 LOS/Delay B/14 A/9 A/7 B/14 SH-39 Collins Siding Rd. LEGEND Level of Service/Seconds of Delay ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects The first phase of this project is underway. It includes early conceptual designs, gathering public input, baseline survey and environmental information as key inputs that will inform each project’s alternatives. The next phase, estimated to begin in summer 2021, will include more detailed environmental documentation and design development as the projects progress towards a preferred design selection. Another public meeting will take place later this year. Construction on these projects is currently scheduled for 2026. Schedule (Schedule is subject to change) Conduct Public Outreach Develop Conceptual Designs Gather Baseline Survey, Traffic & Environmental Information W I N T E R S P R I N G S U M M E R F A L L 2 0 2 1 Begin Detailed Environmental Documentation & Design Work on Preferred Design Continue Public Outreach ---PAGE BREAK--- WEST BLACKFOOT: Transportation Improvement Projects Project Comments and Information Comments on these projects will be accepted until April 16, 2021. To provide comments, you can submit a comment form at tonight’s meeting or send comments using the contact information below. These displays are also available on the project web page. Visit www.cityofblackfoot.org and scroll to the middle of the homepage. The project page is featured in the “Community Spotlight.” Bryant Kuechle, Public Involvement Manager • Email: [EMAIL REDACTED] • Phone: (208) 739-3048 • Mail in comments to: The Langdon Group 275 South Fifth Avenue, Ste. 220 Pocatello, ID 83201