Construction
details:
Limestone
cobble
varying in size from 6 to 18 inches (donated by Lafarge) was used to
build the
reefs. Reefs are located adjacent to the Cement Plant reef and CKD
reef; sites where
spawning lake trout congregate. The East Reef serves as a reference
site and
will not be altered. Different
reef
configurations allow evaluation of height, size, and orientation as
factors
that affect spawning and egg survival.
Stage
I – Eight
small ‘pilot’ artificial reefs were built in 2010 to begin
evaluation
of spawning
activity.
•
each reef is 30 feet in diameter by 9 feet high.
•
Monitoring wells were installed in six reefs to measure water
quality within the reef structure
Stage
II –
Construction of functional prototype reefs was completed in summer, 2011
•
24 reefs, 8’ wide, 75’ long.
•
reefs are either 5' or 10' high, oriented either NW-SE or
NE-SW
•
one large reef, 300’ long, was added
Schematic diagram of reef construction
(click on image for detailed view)
Map of Thunder Bay and Reef Locations
zoom in or out using the +/- in the top left corner; click
on reef icons for coordinates, reef depths, and photographs
View Thunder Bay
Reef Map in a larger map
