HomeMy WebLinkAbout2012-08-29 Received - MnDOT Suggested Tree & Shrub List Sr CROIX RIVER CROSSING PROJECT - VISUAL QUALITY MANUAL
CHAPTER 3
MINNESOTA TH 36 /TH 95 INTERCHANGE
TABLE 3.1
3.3 RECOMMENDATIONS SUGGESTED TREE AND SHRUB LIST
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To maintain the wooded visual character of the TH SC' v:-,..'
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36 /TH 95 interchange area landscape, open ground
areas associated with the interchange should be densely LOWER BENCH -EAST OF TH 95
planted with native trees and shrubs between and along
roads and ramps (Figures 3.5, 3. and 3.7). Over time, TREES
this vegetation will attain sufficient height and density
to visually screen many of the interchange features Green Ash Fraxinus pennsylvanica
from the St. Croix Overlook, the river, and adjacent Basswood Tilia americana
neighborhoods. Moreover, this restored vegetation will Black Ash Fraxinus nigra
return a wooded character to the TH 95 corridor and Red Oak Quercus rubra
will reduce the openness and scale of the interchange Red Maple Acer rubrum
(Figures 3.8 and 3.9). In Figure 3.9, note the extent to Silver Maple Acer saccharinum
which a bridge is screened by trees. The approaches to Cottonwood Populus deltoides
the new river bridge are similar in height to the bridge
in this image. Figure 3.IO is a location map of the SHRuss
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computer visualization of TH 95 shown in Figure 3.11.
Outward views for motorists will be primarily of forest American Hazelnut Corylus americana
plants indigenous to the St. Croix river terraces. A list Gray Dogwood Cornus racemosa
of trees and shrubs for the interchange area is provided Pagoda Dogwood Cornus alternifolia
in Table 3.1. Speckled Alder Alnus incana
b Winterberry Ilex verticillata
Native trees and shrubs should be planted, outside of
the clear zones, between the various roadways, and also UPPER BENCH -WEST OF TH 95
beneath the main bridge approach structure and the el-
evated ramp structures east of TH 95. Several species of TREES
deciduous trees and shrubs are suitable for the partial Red Oak Quercus rubra
shade that will be cast by the high overhead roadway Basswood Tilia americana
structures. Moving from west to east, vertical clearanc White Oak Quercus alba
es under the elevated roadways will increase to the ex-
tent that tall growing trees can be planted beneath the Red Maple Acer rubrum
bridge approaches. The elevated structures may slightly Sugar Maple Acer saccharum
limit the amount of rainfall reaching the ground for Paper Birch Betula papyrifera
plants; however, this reduction in precipitation will be Green Ash Fraxinus pennsylvanica
slight due to windblown rain, surface runoff, and suf-
ficient groundwater. Under the west (abutment) ends SHRUBS
of the elevated structures, where vertical clearances
Prickly Gooseberry Ribes cynosbati
are reduced, it will be appropriate to use mostly shade
Pagoda Dogwood Cornus alternifolia
tolerant and drought resistant plants to vegetate these
Nannyberry Viburnum Viburnum lentago
Red Elderberry Sambucus pubens
MINNESOTA DEPARTMENT OF TRANSPORTATION
3-4 WISCONSIN DEPARTMENT OF TRANSPORTATION