St. Johns River

Monroe Harbour Marina - Sanford, Florida (407) 322-2910



























Jacksonville to Sanford - 160 Statute Miles

The St. Johns River is one of the safest and easiest gateways from the Atlantic Ocean. Between Mayport and Sanford, the river is an enjoyable cruise.


To Sanford, overhead clearance is set at 45 feet by three fixed bridges. Snags are seldom a problem in main channel, but side streams and sloughs should be approached carefully. Be particular observant from November through March, when manatees are in residence. Current south of Palatka can be influenced by the water level in the upper (southern) part of the river, as is flows south to north.


The St. Johns is the longest river in Florida - 310 miles long. It is one of the few rivers in the United States that flows north. The source of the river, or headwaters, is a large marshy area in Indian River County that flows north and turns eastward at Jacksonville to its mouth in the Atlantic Ocean.

The total drop of the river from its source in swamps south of Melbourne to its mouth in the Atlantic near Jacksonville is less than 30 feet, or about one inch per mile, making it one of the "laziest" rivers in the world. Major tributaries, or smaller streams and rivers that flow into the St. Johns River include the Wekiva River, Econlockhatchee River and the Ocklawaha River.

Florida waters are often a natural brown-tea color caused by tannins from decaying native vegetation. Since light is attenuated by both color and turbidity, Secchi depth in many Florida waters is often very shallow (0.52.0 meters) compared to water bodies in other parts of the world. In Florida, the measurement is valuable for observing changes occurring within a water body over time.



Distances in Statute Miles




ICW Palatka N End Lake George Astor Monroe Harbour
ICW 0.0 74.3 105.0 121.0 160.0
Palatka 74.3 0.0 30.4 46.6 86.1
N  Lk George 105.0 30.4 0.0 16.2 55.8
Astor 121.0 46.6 16.2 0.0 39.5
MHM 160.0 86.1 55.8 39.5 0.0


ICW Palatka N End Lake George Astor Monroe Harbour

Marina Location: 28.816N  81.264W

St Johns River Charts

11490 Approaches to St. Johns River; St. Johns River Entrance
11491 St.Johns River-Atlantic Ocean to Jacksonville
11492 St.Johns River Jacksonville to Racy Point
11495 St.Johns River Dunns Creek to Lake Dexter


St.Johns River Lake Dexter to Lake Harney; Lake Monroe

NOAA's On-Line Chart Viewer





Pumpout Locations

Marina Approach


River Bridges






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