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GEOLOUC ','L HISTORY
History of Development
During glacial times, the Northern Watershed overflowed through the East Ravine watershed to Glacial River Warren or what
is now the Mississippi River. Today that connection still exists but only for very extreme events that would inundate
neighborhoods and public infrastructure in the Military Road/CSAH 19/70th Street vicinity. Glacial flows are not a concern in
today's climate. However, high intensity rainfall events are increasing in frequency. Further, the history of development in the
District has increased how much of that rainfall runs off of the watershed. Together, these factors drive an existing and
increasing risk of flooding that drive the need for this project.
Source: SWWD Storymap
East Ravine
CITY OF COTTAGE GROVE
GLACIAL VALLEY PARK STRUCTURE
DECEMBER 14, 2021
Glacial Processes
Historical glacial action strongly shapes the District. An ancient inter -glacial stream runs north to south
through the District and is reflected today in bedrock and surficial topography that drains from Armstrong
Lake in Oakdale through Wilmes, Colby, and Bailey Lakes to the District's CDSF and then downstream
through Cottage Grove Ravine Regional Park to Ravine Lake and then the Mississippi River. The glacial
melt that carved this valley through the District also deposited over 100 feet of glacial outwash in the
CDSF with characteristically high infiltration rates and high potential for recharge to underlying aquifers.
This feature makes the CDSF unique and highly effective as a regional infiltration facility and helps
mitigate potential downstream impacts and provides the potential to recharge underlying aquifers.
Source: SWWD Storymap
CITY OF COTTAGE GROVE
GLACIAL VALLEY PARK STRUCTURE
DECEMBER 14, 2021
GEOLOGY AND 7HE PR ODE ECOSYSTEM
Glacial Valley Park
Military Road Jamaica Avenue
Manning Avenue
St. Croix River
A
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Quaternary setliments
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Geological History of Glacial Valley Park and Surroundings
Within a couple hundred feet of the site, Jordan Sandstone lies beneath the thick layer of quaternary sediments.
Jordan Sandstone (from the Upper Cambrian epoch) is approximately 500 million years old. The sandstone is
made up of marine depositional environments from the time when most of North America was covered by shallow sp
sea.
Above the bedrock, this area is made up of a glacial terrace which consists of a thick layer of sand and gravel
deposits from when glaciers retreated some 10,000 years ago. At this location, due to the pre -glacial erosion of the
bedrock, the sediment deposits are up to 100 feet thick which is very uncommon. For this reason, the region is well
suited for filtering ground water on its way to the deep aquifers.
Additionally, the thick sand and gravel deposits provide a perfect sub -grade environment for prairie grassland
ecosystems. Prairie ecosystems thrive in areas with granular ground conditions and use their deep roots (up to 15
feet thick) to soak up stormwater runoff and improve the environmental conditions downstream to the Mississippi
River.
Native prairie land is the most endangered ecosystem in North America'. Restoring old farmland
can help benefit the local and regional ecosystem and help protect our rivers and streams.
Sources:
.hftps://www.greatr'tvergreening.org/blog/cedarhurst-meadows-park (per Kansas State University
L 1 \ SECTION CUT THROUGH COTTAGE GROVE NEAR GLACIAL VALLEY PARK
Glacial Valley Park
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CITY OF COTTAGE GROVE
GLACIAL VALLEY PARK STRUCTURE
DECEMBER 14, 2021
PLAN CONC FEF17S
PLAYGROUND
VIEWS OUT
�- TO PRAIRIE
L
�1 MAIN LEVEL FLOOR PLAN
1/16" = 1'-0"
0 12' 24'
y, A ��„ we, -I, III �ba,�we ,"o ae,�,k.,a,,
.21M CONCEPT PLAN
1 Comm No: 212243
e. M
MATERIAL CONCEF 17S
METAL PANEL AT
ROOF AND SIDING
SOUTH SIDE (ENTRY)
THERMALLY MODIFIED
WOOD SIDING
NORTH SIDE (OUTDOOR SPACEIICE RINK ACCESS)
METAL PANEL AT
ROOF AND SIDING
i9fi�W IT
, il
ICI I�I
THERMALLY MODIFED
WOOD SIDING
STONE
MASONRY
STONE
MASONRY
CITY OF COTTAGE GROVE
GLACIAL VALLEY PARK STRUCTURE
DECEMBER 14, 2021
hermally Modified Wood
sourced from sustainable
)rests of North America,
ertical wood siding emulates
ie thin, vertical fields of tall
rasses and forbs found in the
urrounding prairie habitat of
:ottage Grove.
tone Masonry
Sourced from local quarries, a
stone represents the immense
scale of time evident in the
geological history of the area
(500 million year old Jordan
Sandstone). On a smaller
scale, stone gravel and sand
deposits from the most recent
ice age, form the the foundation
for the prairie landscape at the
park.
Other Materials
Metal panel, aluminum
CW/windows, glass, metal
overhead door, gravel
landscape rock.
MATERIAL
CONCEPTS
` 3 Comm No: 212243