Bourbeuse River at Union

1. 31.70 ftAt this height, the McDonald's restaurant at U.S. Hwy 50 and Missouri Hwy 47 will begin flooding without additional protection. They can install flood panels around the restaurant to add an additional 3 feet of protection to this height.
2. 31.30 ftU.S. Highway 50 will be closed near this height in both directions near the Bourbeuse River bridge.
3. 31.00 ftNear this height...Missouri State Highway 47 will be closed in both directions just north of U.S. Highway 50.
4. 29.60 ftPhillips 66 at East Main and Highway 47 North floods at floor level.
5. 29.20 ftLiquor Express store on U.S. Highway 50 begins to flood.
6. 28.90 ftBusiness front adjacent to Fenton Creek, west of Hwy 47, and south of railroad bridge floods from Fenton Creek backwater. Mistler's Oak Furniture on Missouri Highway 47 begins to flood from Fenton Creek backwater.
7. 26.90 ftParking lot at store front adjacent to Fenton Creek, west of Hwy 47, and south of railroad bridge begins to flood.
8. 26.60 ftDickey Bub Farm and Home begins to flood at floor level.
9. 26.40 ftThe store front adjacent to Dickey Bub begins to flood.
10. 25.60 ftWater enters the lift station behind the gas station on East Main.
11. 25.20 ftState Highway AT (Old Route 66) floods near the intersection with State Highway O near the I-44 bridge over the Bourbeuse River.
12. 24.50 ftWater begins flooding the streets and property of the Bourbeuse Camp Trailer Park at Missouri Highway AT and U.S. Highway 50.
13. 24.20 ftNorth Bend Loop Road south of Union begins flooding near this height.
14. 23.50 ftParking lot at East Main Street and East State Street is covered.
15. 23.40 ftEast Main Street is closed.
16. 23.00 ftRock Road begins to flood.
17. 22.50 ftWater begins covering East Main Street.
18. 22.30 ftThe lower quarter of the parking lot at the Dickey Bub Farm & Home store is flooded.
19. 21.90 ftWater begins covering Old County Farm Road.
20. 21.00 ftNear this height, water begins covering Highway O between Highway AM and American Inn Road.
21. 19.80 ftNear this height, Missouri State Route UU is closed in both directions.
22. 17.00 ftFlat Creek backs up to Smeltzer's Park.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.

Most recent crests

• April 22, 2025: 15.35 ft
• April 7, 2025: 21.30 ft
• November 7, 2024: 19.13 ft
• April 4, 2024: 15.14 ft
• August 5, 2023: 19.60 ft
• March 30, 2023: 18.55 ft
• March 6, 2023: 17.29 ft
• May 24, 2022: 18.18 ft
• May 8, 2022: 22.72 ft
• February 2, 2021: 15.37 ft

• UpstreamBourbeuse River at High Gate
• Missouri River at Washington
• Meramec River at Pacific
• Big River at Byrnesville
• Meramec River at Sullivan
• Meramec River at Eureka
• Big River at Richwoods
• Dardenne Creek at O'Fallon
• Meramec River at Valley Park

Forecasts by the North Central River Forecast Center. Forecasts are issued as needed during times of high water, but are not routinely available. River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time. River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.