The design contemplates the filling up with stone and gravel on
up-stream side of dam about the triangular space that would be formed by
the production of the line of face of flat dam till it struck the rock.
Part of that was done from the ice last winter; the balance is being put
in this winter.

Observations last summer showed that the calculations as to the raising
of the surface of the river were correct. When the depth on the crest
was 2.50 feet, the water at the foot of the Longue Sault was found to be
25 in. higher than if no dam existed. The intention was to raise it 24
in.

The timber slide was formed by binding parallel piers about 600 feet
long up and down stream, as shown on the map, and 28 ft. apart, with a
timber bottom, the top of which at upper end is 3 ft. below the crest
of dam. It has the necessary stop logs, with machinery to move them, to
control the water. The approach is formed by detached piers, connected
by guide booms, extending about half a mile up stream. See map.

Alongside of the south side of the slide a large bulkhead was built, 69
ft. wide, with a clear waterway of 60 ft. It was furnished with stop
logs and machinery to handle them. When not further required, it was
filled up by a crib as before mentioned.

The following table shows the materials used in the dam and slide, and
the cost:

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| | | Stone | Exca- | |