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
Fri
5AM - 9AM
06 February 2026
W 7 knots increasing to NW 11 knots. Gusts up to 28 knots.
Increasing from 0 to 5°C
UV Index: 0 - Low
Sunny
Fri
9AM - 1PM
06 February 2026
- NW 10–13 knots. Gusts up to 26 knots.
- Increasing from 4 to 7°C
- UV Index: 2 - Low
- Mostly fine
Fri
1PM - 5PM
06 February 2026
- NW 9–12 knots. Gusts up to 22 knots.
- 3 to 10°C
- UV Index: 1 - Low
- Partly cloudy