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Research Natural Area

Marble Lake Lookout

[photo:] Marble Lake Lookout RNA. Photo by Lucy Tyrrell.State: Minnesota

County: Lake

Forest: Superior

District: Laurentian

Established: 1988

Acres: 120

Description: This RNA is notable for its old-growth northern hardwood forest and sensitive herbaceous species, including broad-leaved spring beauty (Claytonia caroliniana) and white baneberry (Actaea pachypoda). Hardwood species include, sugar maple (Acer saccharum), yellow birch (Betula alleghaniensis) and basswood (Tilia americana).

Ecological Information

Physical and Climatic Conditions:

Nearest weather station, with distance and direction from RNA: The closest station is in Two Harbors, MN, which is located 18 air miles (29 km) south of the RNA.

Annual precipitation (type, seasonal distribution) : Average annual precipitation is 29.09 inches (73.88), with 11.22 inches (28.5 cm) falling in summer. Average annual snowfall is 41.7 inches (105.9 cm).

Maximum and minimum temperatures :
Maximum: 99 ºF, Minimum: -34 ºF
Annual: 31.0 ºF, 49.6 ºF
January: 3.4 ºF, 22.0 ºF
July: 53.3 ºF, 75.5 ºF

Elevation: Elevations range from 1640 to 1765 feet (536-77 m) at the Lookout Site.

Geology and Soils: The RNA is within the Highland Moraine. Soils are sandy over sandy, well drained, light colored soils.

Ecological Classification & Inventory

Section: Northern Superior Uplands (212L)

Subsection(s): North Shore Highlands (212Lb)

Landtype Association : 12

Landtype :Upland Deep Medium Loamy Dry (UDLDM-14)

Landtype Phases :10, 17, 29, 31, 55, 65

SAF Cover Types (list acres): Kuchler Types (list acres):
12 Black spruce (12) 85 Conifer Bog (24)
18 Paper birch (8) 90 Maple-Basswood (60)
27 Sugar maple (60) 98 Northern Hardwood-fir (18)
37 Northern white-cedar (12)  
39 Black ash-American elm-red maple (28)  


Common Shrub Species: Choke-cherry (Prunus virginiana), red-berried elder (Sambucus pubens), mountain maple (Acer spicatum).

Common Herbaceous Species: White baneberry (Actaea pachypoda), broad-leaved spring beauty (Claytonia caroliniana).

Related Publications:

Zeitz, Dean N.; Koller, Norman F. 1988. Establishment Record of the Marble Lake Lookout Research Natural Area within the Superior National Forest. Unpublished report on file at the Northern Research Station, Rhinelander, 44 pages.

Last Modified: 11/09/2006