Forest Resource in Geographical Management Units
- Overview & State Map
- Explanation of GMUs
- BadAxe - LaCrosse
- Black - Buffalo - Trempeleau
- Central Wisconsin
- Grant - Platte - Sugar - Pecatonica
- Headwaters
- Illinois Fox
- Lakeshore
- Lake Superior
- Lower Chippewa
- Lower Fox
- Lower Rock
- Lower Wisconsin
- Milwaukee River
- Mississippi River
- Root Pike
- Sheboygan
- St. Croix
- Upper Chippewa
- Upper Fox
- Upper Green Bay
- Upper Rock
- Wolf
Upper Green Bay GMU
Below are statistics, charts and general information on the Upper Green Bay GMU. All chart and map links open in a separate window.
The Upper Green Bay GMU is heavily forested with 63% of the land considered timberland. Most of this is located in central and northern Marinette County and northern Oconto County.
Forest acreage
The area of timberland in the Upper Green Bay GMU has increased by 10,170 acres or 1% over the past decade. The most recent survey (2001-2005) indicates that productive forest land makes up about 1.1 million acres or 64% of the total land area of the GMU.
View bar chart: Timberland acreage in the Upper Green Bay GMU
Forest types
Aspen is the most common forest type, accounting for 21% of timberland acreage. Maple-dominated types, sugar maple/beech/yellow birch, hard maple/basswood and upland red maple, make up another 22% of timberland area. Bottomland forest types, such as black ash/elm/red maple and northern white cedar, make up 14% of acreage. View bar chart: The most important forest types in the Upper Green Bay GMU
Growing stock volume
Total growing stock volume in the Upper Green Bay GMU is 1.4 billion cubic feet. Red maple, northern white cedar and red pine together make up 35% of total volume.
Ratio of growth to removals
Net annual growth of trees (50.7 million cubic feet) in the Upper Green Bay GMU exceeds annual removals (13.3 million cubic feet) by about 280%. Tamarack, eastern hemlock, and quaking aspen account for 18%, 14%, and 14%, respectively, of growing stock removals.
Habitat type
About a third of the timberland in the Upper Green Bay GMU is classified as either mesic-wet mesic or lowland. Another 13% is very dry-dry. View pie chart: Major habitat types in the Upper Green Bay GMU
View map: Major habitat types in the Upper Green Bay GMUTimberland ownership
The majority (61%) of the timberland in the Upper Green Bay remains in private hands but public ownership is fairly high as well. The national forests, county, municipal and state governments own the remaining 39% of forest land. The Upper Green Bay GMU has the highest amount of national forest timberland of all management units.
View pie chart: Ownership of Timberland in the Upper Green Bay GMU