- Portage North, 195 rods to Madden
- Portage South, 120 rods, into the North Kawishiwi River
- DNR Lake No. 380718
- Lake Map No. C1485
- Lake Table No. 6B
- MDH Fish Consumption Advisory
- MPCA Water Quality - N/A
Full image approximately 2
Greenstone is a deep, clear, mid-sized
lake just outside the boundary of the BWCAW, 16¾ miles WNW of Forest
Center, and 9 miles ENE of Ely. Covering 345 acres, it is 1¾
miles long NE/SW and drops to a maximum depth of 72' with most of the lake
deeper than 15'. A small stream out of the northeast end of the lake
drops into Conchu, a bit more than ½ mile
to the south. Greenstone Creek flows out of the west end, 1½
miles to its confluence with Pickerel Creek just below Pickerel
Lake. A 120 rod portage out of the southwest end of Greenstone
climbs 62' before dropping 128' into the North Kawishiwi. A 195 rod
portage out of the north end of the lake connects with Madden.
The forest surrounding Greenstone was rather thoroughly logged by the
St. Croix Lumber Company of Winton during the 1898 to 1912 early logging
period and is all second growth
forest. The Independence Day windstorms of 1999 did no significant
damage in the Greenstone area.
Greenstone supports one established campsite,
at the east end near the Kawishiwi River portage.
Greenstone is outside of the BWCAW proper,
but is connected by portage and, perhaps most importantly, has no direct
vehicular access for motorboats. The nearest road access is an unimproved
forest road which runs up to Madden Lake from the Fernberg Road. From
there it is a hilly, 195 rod carry into Greenstone. Greenstone is
not a BWCAW Entry Point but a side trip up to the lake from the North Kawishiwi
would be appealing, whether by the established portage, or by bushwhacking
up Pickerel and Greenstone Creeks. Much of the latter appears to be
relatively broad and navigable.
Gabbro supports populations of Bluegill
Largemouth Bass (Micropterus
salmoides), Northern Pike (Esox
lucius), Rock Bass (Ambloplites
rupestris), Walleye (Stizostedion
vitreum), White Sucker (Catostomus
commersoni), and Yellow Perch (Perca
flavescens). Walleye were stocked in 1993. Tullibee
(Cisco) (Coregonus artedi)
may also be present.
Notes and Comments
Greenstone is likely named for, well, greenstone,
a basaltic lava with a grey-green to yellow-green coloring derived from
the presence of the mineral Chlorite. A metamorphic rock, it indicates
volcanic origin followed by periods of intense heat and pressure.
This rock was probably buried deep and later exposed by erosion. It
occurs in belts running more or less NE/SW and includes the Ely Greenstone
formation, which crops up in the town of Ely. Pillow
structure in Ely Greenstone suggests lava which hardened underwater.
Greenstone is noted for being some of the oldest rock to be found on the
surface of the earth, anywhere on the planet.
Last updated on
11 April, 2004