NOAA, Tides and Currents,
Real Time Data, Little Rapids, (by sugar Island ferry), 3 days
|Q: How low is water in the St Mary's River?
A: Look at the The Little Rapids water levels graphs.
How does the levels change?
- Winter snowmelt and summer rainfall do set the stage for spring and
fall waters levels, but overall water flows are regulated or
effected by the following; the St Mary's River Dam Gates above the rapids, amount of
boat traffic through the locks, and water being released by the 3 Hydro Generating
Stations has an overall effect.
- Combined with a strong North-West wind across lake superior that blow
surface waters out of the St Mary's River within the cities of Sault Ste.
Marie will have a great effect on overall river water levels. Usually a
South-East wind will push back or withhold water.
Drought of 2012 (record lows)
- Winter of 2012 left us with very little snowfall, plus an early
spring, set the stage for low river waters for our spring Crane Launch.
Then continuing with a with a hot summer with very little rain caused
water levels to drop even more for our fall Crane Haulout. The stage was
already set for 2012 as low water levels were already below the Low Water
A.S.C. Water Levels
- In 2010, 20 feet of light dredging was performed to ensure that
water depth for the larger keel boats would be adequate along the east
dock to the gin-pole area.
- In 2012, with the lowest waters levels ever seen by senior members,
raised more concerns of water levels with the club more closely to monitor
water levels and to explore a set of options for members to discuss and
- On Oct 15, 2012 water levels dropped to -(negative)28 inches
below LWD (Low Water Datum), low enough that one could walk over on dry
land to the small island in the bay, just east of the east dock and dingy
dock. During this time, large keel boats had to wait until water levels
rose to and above -18 inches as to prevent keels from dragging in the mud
over the shallowest area for haulout. The executive permitted all large
keel boats to raft up together after de-rigging at the gin pole, rather
than heading back out to the moorings in case water levels were to drop
again, but at haulout, waters levels were adequate.
- Lowest low observed: Dec 24, 2012 was negative -38 inches
A.S.C. Level Measurement
- To give an example, the picture at the left shows at the shoreline
end, the far north end, of the east floating dock, the water levels that
everyone at the club uses as a visual guide by observing middle of the "H"
Beam mounted on the break wall to the water levels. This flat spot is
comparable to the LWD Zero set point at the NOAA Little Rapids just across
the river by sugar island ferry.