Tier II studies included seven closely coordinated but independent studies. These seven studies analyzed the potential impacts of widening and reconstructing the interstate in seven distinct geographic areas
The documents have been produced to detail how improvements to I-70 could impact the natural and man-made environments. Each document provides an evaluation of the reasonable alternatives for widening and rebuilding I-70 and recommend a preferred alternative.
These were evaluated in 2004-2006 and re-evaluations are ongoing for the Improve I-70 projects.
| Section Number | From | To | COMMUNITIES | Documents |
|---|---|---|---|---|
| 1 | KC Freeway System | Route 131 (Odessa) | Selsa Independence Blue Springs Grain Valley Oak Grove Bates City Odessa |
EA - Tier II Section 1 |
| 2 | Route 131 | Route 5 | Odessa Aullville Higginsville "Junction" Concordia Emma Sweet Springs Marshall Junction Ridge Prairie Chouteau Springs Lamine Lick Boonville |
EA - Tier II Section 2 |
| 3 | Route 5 (Boonville) | Route BB (Rocheport) | Boonville Overton Rocheport |
EA - Tier II Section 3 Re-evaluation of SIU3 (May 2020) Re-evaluation of SIU3 (March 2021) |
| 4 | Route BB | Route Z (East of Columbia) | Rocheport Columbia Prathersville Switzler Harg Shaw |
EIS - Tier II Section 4 Re-evaluation of SIU4 (December 2023) |
| 5 | Route Z | US Route 54 | Lindbergh Millersburg Hereford Earl Eastville Kingdom City |
CE - Tier II Section 5 Re-evaluation of SIU5 (April 2024) |
| 6 | US Route 54 (Kingdom City) | Route 19 (Montgomery City) | Kingdom City Calwood Williamsburg Mineola Danville Montgomery City |
EA - Tier II Section 6 Re-evaluation of SIU6 (March 2020) Re-evaluation of SIU6 (August 2022) Re-evaluation of SIU6 (July 2024) |
| 7 | Route 19 | STL Freeway System (US Highway 40) | New Florence High Hill Jonesburg Pendelton Warrenton Truesdale Innsbrook Wright City Foristell Flint Hill Wentzville Josephville Lake St. Louis |
EIS - Tier II Section 7
|
Study Types Key:
Documented Categorical Exclusion (CE) Improvements to this corridor section will have no significant environmental impacts
Environmental Assessment (EA) - The degree of environmental impact caused by improvements to this corridor section is unknown. An EA will result in either a FONSI (Finding of No Significant Impact) or an EIS.
Environmental Impact Statement (EIS) - Improvements to this corridor section will have a significant environmental impact, requiring in-depth analysis and efforts to minimize those impacts