Notice Not affiliated with the Master Mariners Benevolent Association (MMBA) or any successor organization. v.2026.05
General Overview
Facility 🚤 Full Service Marina Est. Slips ~80 Water Canal Est. Parking ~120 spaces Lot Size Large (150+) Lot Type Surface Confidence High

Medium-scale marina with extensive covered slips along a canal, multiple white-roofed buildings, and a large unpaved parking area with numerous visible vehicles.

Aerial view of Polestar Marina and Uncharted Service
inland waterway

Polestar Marina and Uncharted Service

Saint Charles County, MO

Polestar Marina and Uncharted Service is situated in Saint Charles County, Missouri, along the Missouri River, an inland waterway that winds through the rolling hills and forested banks of the Midwest, near the greater St. Louis metropolitan area. This marina serves recreational boating on the freshwater Missouri River, catering to activities such as fishing, cruising, and exploration of the river's dynamic currents and nearby natural habitats. Its location provides access to a region rich in Midwestern riverine landscapes, ideal for inland waterway adventures.

Location Saint Charles County, Saint Charles County, Missouri
Capacity ~80 slips
Coordinates 38.9323, -90.4766

Nearby Marinas in Missouri

Marina Parking & Access Control

Marinas typically need to separate slip holder parking from day-visitor parking, trailer areas, launch ramps, and secure dock access points. Modern facilities use barrier gate systems to enforce these zones automatically — allowing permitted vehicles through via transponder or keycard while logging all access events.