West St. Louis metro drainage atlas
Eight communities. Eight local water paths.
A drainage decision changes with the plat, clay, municipal process, floodplain or shoreline constraint, and legal outlet. These guides begin with the local evidence.
01 · 4 miDardenne PrairieDardenne Prairie grew 17.8% from the 2020 Census base to the July 1, 2025 estimate of 15,032. Newer plats here often need corrective grade and French drains after original fill settles.02 · 6 miSt. PetersSt. Peters' Census QuickFacts July 1, 2025 estimate is 61,479. It is the next I-70 suburb east of O'Fallon, so standing-water and downspout jobs commonly cross both city limits and share the same clay-soil plats.03 · 8 miCottlevilleCottleville's July 1, 2025 Census estimate is 6,717, up 19.6% from 2020. Drainage work splits between older Main Street lots and new subdivision edges that were mass-graded.04 · 10 miLake St. LouisLake St. Louis' July 1, 2025 Census estimate is 19,129. Shoreline and dam-community lots need outlets that do not dump toward the lake without a planned discharge.05 · 11 miWeldon SpringWeldon Spring's July 1, 2024 Census QuickFacts estimate is 5,304. It is a small upland city on the Katy Trail and former Weldon Spring Site corridor, where small-town pages are rarely targeted.06 · 12 miSt. CharlesSt. Charles' July 1, 2025 Census estimate is 72,561. River-corridor floodplain lots and west-side upland plats need different outlet plans and city floodplain-development review.07 · 14 miWentzvilleWentzville's July 1, 2024 Census QuickFacts estimate is 48,646. Fast I-70 west growth produced new plats whose original grade often settles into backyard basins.08 · 22 miChesterfieldChesterfield's July 1, 2025 Census estimate is 49,309. Chesterfield Valley flooded in 1993 and is now behind the Monarch-Chesterfield Levee District, so discharge planning has to respect the levee and storm system.
Prepare the local request
Bring the address into the lot study.
Include city limits, known permit history, where water sits after rain, downspout locations, and any grading or hardscape work already planned.