I-25 Landscape Master Plan

• Project Type: Water Conservation Plan
• Project Name: Department of Transportation
• Title: I-25 in Denver, Colorado Landscape Master Plan
• Date: 5/5/1988
• County: Denver
• Water Conservation - Doc Type: Complete Plan

. Incorporate plantlngs of various lurf and or-
namenlal grasses, either Intermixed, or with
patches of wildflowers for visual interest. At-
tempi to emulate natural groupings and
patterns.
. On slopes, grasses used between plant
groupings should be unilorm in size and teldure
wilh grouping edges more sharply defined.
. Wildllower plantings can be separaled into
beds for protection againsl premature mowing;
if wildt/owers are 10 be plan/ed among Ihe lurf
grasses for a meadow effect, some delineetien
should be provided to prevsnt mowing.
. Use long continuous windrows 0' belh trees
and shrubs where screening Is needed.
. When using the Natural landscape ap-
proach,tree sizes should reflect natural stand
densities and size charactaristlcs and shrubs
should be used in dense groupings. Edges be-
tween planting groups (/urllwlldflowarsl
groundcovers to shrub/lree) should appear
soller Ihan those in the Urban approach,
. River cobble, rock, mulch, and etc. can be
used as accent elements under and around
planling groups,
. long lerm mainlenance is a key element
thai must be evaluated and budgeted for
during Ihe design phase when choosing plant
material.

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ROADSIDES

The following general guidelines are applicable to
planting areas along Ihe roadway:
. Trees or shrubs in linear areas shall meander
in an informallashien.
. Breaks belween groups 01 trees shall be at Ir-
regularly spaced intervals.
. Masses 01 shrubs may be used adjacen/to
large areas 01 rivers/one, 10 provide visual

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translllon.
. Deslrabte views shall ba framed or left unob-
structed by using large shrubs in lieu of tall
trees to screen the roadway.
. To minimize maintenance requirements, use
of groundcovers (other than grasses and wild-
flowers) shall be minimal In roadside areas. Use
low massed shrubs where low plants are
desired,
. Each continuous mass of treea or shrubs
shall contain onty a few species (except
accents),
. Triangular spacing of massed plants Is re-
quired.
. "Accent groups" shall contain from three to
nine plant species or as space allows.
" Shrubs and bankcovers should nOl be placed
In riverslone excepl al locations where slone is
being used for erosion control.
"Where visual screening Is /leeded plants
musl be evergreen or large shrub hedgee.
" Trees may not be ptanted closer than 30 feet
from the edge of the nearest driving tane unless
guardrail Is present. When guardraU Is luslUied
for highway purposes, trees can be planted
within 12 feet of the nearest driving lane.

13.

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