7th & Illinois Ave. Stormwater Improvements
Joplin, MO
Background
Illinois Avenue would frequently flood, up to 4.3’ above the edge of the road during a 100-year rainfall event. This was due to insufficient inlets and piping from the road into Joplin Creek and limited capacity in the creek’s main channel. The flooding also caused damage to the adjacent properties in the past. The goal of this project was to increase the capacity of Joplin Creek and reduce flooding in the surrounding area.
Activity
The flow line of Joplin Creek was lowered approximately 2’ beginning at a head cut and continuing throughout the length of the project. Joplin Creek was widened and a precast block retaining wall installed to protect the excavated channel sides. New box culverts and pedestrian bridges were installed to match the enhanced channel capacity. Inlets and piping were added to both sides of Illinois Avenue and over to Joplin Creek.
Technical Design & Features
- Approx. 1,900 LF of channel improvements
- 18,684 SF of precast block retaining wall 4’-14’ tall
- 132 LF of 9’x11’ box culvert under 7th street
- Two 52 LF of 6’ wide pedestrian bridges
- 36 LF of triple 12’x9’ box culvert under 9th street
- Piping & inlets
- Flumes
- Curb & gutter
- Paving
- Sidewalk
- Riprap
- 2 aerial sewer crossings
- Miscellaneous work
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