About John's Boat Harbor
Located at 2407 Hwy C, St Charles, MO 63301, United States Member only Marina on the Mississppi River Upper Mississippi River Mile Marker 231.8
Facilities
Electricity
Petrol
Water
Showers
Toilets
BoatbuilderCOORDINATES
38.87821 N, -90.62325 E
Port Information
Telephone
Berth Sizes
< 10m, 10-20m
Depth at MLW
< 2m
Manoeuvrability
Fair
Channel Marking
Fair
Port of Entry
No
Overseas Visitor Berths
Yes
Dock Type
Floating
Style Side To
Yes
Tidal Flow
Beware
Active Winter
Yes
Weather Forecast
Sun
5AM - 9AM
17 May 2026
S 6 knots increasing to 8 knots. Gusts up to 20 knots.
17 to 22°C
UV Index: 0 - Low
Cloudy
Sun
9AM - 1PM
17 May 2026
- S 7–14 knots. Gusts up to 19 knots.
- 20 to 28°C
- UV Index: 8 - Very High
- Partly cloudy
Sun
1PM - 5PM
17 May 2026
- S 11–14 knots. Gusts up to 20 knots.
- 29°C
- UV Index: 8 - Very High
- Mostly fine