Lorson Ranch East July 10, 2017
LR East Natural Features Report (Response to Comments Rev 1) Page 1
LORSON RANCH EAST Natural Features Report
Vicinity Map
Prepared By:
702 N. Tejon Street
Colorado Springs, CO
P: (719) 578.8777
W: www.ttplan.net
Lorson Ranch East July 10, 2017
LR East Natural Features Report (Response to Comments Rev 1) Page 2
General Location
The site is 274.59 acres and proposes 826 single family lots located within the eastern portion of Lorson
Ranch in southeastern El Paso County. The project lies east of the Jimmy Camp Creek East Tributary
between the northern and southern property lines. With a combined PUD Development Plan/
Preliminary Plan submittal, Lorson Ranch East will be a continuation of the Lorson Ranch community and
will open up the eastern portions of Lorson Ranch to development as new roadways will be designed
and constructed bridging East & West. The site is currently zoned RM (Residential Medium 7-10 DU/
Acre); RLM (Residential Low/ Medium 4-6 DU/ Acre); and RMH (Residential Medium/ High 10-13 DU/
Acre) as illustrated on the Lorson Ranch Zoning & Conceptual Plan approved by the Board of County
Commissions on November 16, 2006. These land use designations were continued with the amended
Lorson Ranch Sketch Plan approved April 21, 2016. There are no existing structures or facilities
currently owned or maintained by the Lorson Ranch Metropolitan District. There is an existing
Mountain View Electrical substation that shall remain. In addition, the existing SDS (Southern Delivery
System) easement and watermain crosses the property from north to south which shall remain in place.
The design of the Lorson Ranch East development project takes this into account and will cause little to
no impact on this easement.
Topography
The topography of the project site is mixed between relatively flat to slightly rolling and more
moderately rolling hills. There are grade changes of approximately 30-40’ over several hundred feet, yet
grade changes of only 10-15’ over that same distance. The existing slopes range between slightly sloped
of 1-3% up to 5-7% in the more moderately sloped areas. No portions of the proposed site have been
graded with the exception of those areas within the easement of the SDS waterline project. The site is
suitable for development and is not impacted by the flat or moderately steep slopes as current
acceptable state and local best grading practices will be employed. A majority of the site slopes to the
south and west where drainage will be collected into detention facilities prior to discharge into the
Jimmy Camp Creek East Tributary.
Hydrologic Features
The most noticeable hydrologic feature is the Jimmy Camp Creek East Tributary, bordering the
development along the western boundary. This tributary is an existing drainage flowing in a
southwesterly direction that will remain. The existing portion of the east tributary between Fontaine
Blvd. and Lorson Blvd. as shown on the drawings has previously been studied with channel
improvements already constructed. These improvements revised the floodplain and improved the
drainage channel per LOMR Case #14-08-0534p effective date January 29, 2015. Portions of the Jimmy
Camp Creek East Tributary, north of Fontaine Blvd. to the property line, are being studied in conjunction
with this application and will revise the floodplain limits per the analysis. Any required creek
improvements will be implemented as necessary.
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Flood Hazard/ Floodplain
The most noticeable hydrologic feature bordering the development along the western boundary is the
Jimmy Camp Creek East Tributary. The tributary is an existing drainage flowing in a southwesterly
direction. Portions of the property are located within a designated FEMA floodplain as determined by
the flood insurance map, community map number ‘08041C0975F’ effective date March 17, 1997.
However, much of this floodplain has been revised per LOMR Case #14-08-0534P effective date January
29, 2015. This portion of the revised tributary and floodplain lies between Fontaine Blvd. and Lorson
Blvd. and no longer presents any hazards or limitations that would limit development.
Those unstudied portions of the Jimmy Camp Creek East Tributary, north of Fontaine Blvd. to the
property line, are being studied in conjunction with this application and will revise the floodplain limits
per the analysis. The current floodplain delineation presents a temporary hazard to the proposed
development as any lots currently within the floodplain will cannot be platted nor developed until the
floodplain lines have been revised per the LOMR/ CLOMR process. A LOMR/ CLOMR will be submitted
for review and approval by the necessary agencies in order to revise the floodplain limits as needed.
Any required creek improvements will be implemented as necessary.
The development site will drain into several detention pond/water quality basins located centrally and
within the southwest corner of the project limits. Flows will then be conveyed to Jimmy Camp Creek
and/ or off-site in a manner consistent with El Paso County and State requirements.
Vegetation and Soils
A majority of the site is vacant with tall and short grass prairie species. The soils on site range from silty
to sandy claystone and shale with the geology of the area typically stream terrace deposits and alluvium
soils overlying Pierre Shale. For more detailed information regarding soils, please refer to the Soils and
Geology report completed by RMG-Rocky Mountain Group included with the submittal. There are no
existing stands of vegetation or trees on site. Any vegetation within the existing Jimmy Camp Creek East
Tributary will be retained as possible pending required creek or channel improvements.
Scenic Resources & Unique Natural Areas
The natural mountain backdrop of the Rampart Range is perhaps the best natural feature of Lorson
Ranch with sweeping views in nearly all directions. The scenic view shed is impaired somewhat by
intervening development; however, the panoramic views remain quite spectacular. There are no unique
natural features on the site other than the Jimmy Camp Creek East Tributary which has been discussed
above.
Wildlife and Migratory Birds
While the area’s most distinctive wildlife is probably the prairie dog, the Colorado Division of Wildlife
notes the following as also present in the area.
• Mule and White Tailed Deer
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• Pronghorn Antelope
• Fox species
• Coyote
• Rabbits
• Raptors
• Songbirds
• Numerous Small Mammals
Due to the construction activity and adjoining residential developments, it is not anticipated that the
Lorson Ranch East project will have significant impacts on wildlife in the area. However, the existing
Jimmy Camp Creek East Tributary may create an environment that will enhance and create a natural
wildlife habitat corridor. In addition, the existing power line easement is 325’ in width and could also be
used for ground bird nesting or a wildlife migrating corridor.
The U.S. Fish and Wildlife Service’s IPaC mapper and website database (https://ecos.fws.gov/ipac/) was
used to determine the potential of migratory birds within the area. The IPaC mapper listed 22 migratory
birds that may be affected by Lorson Ranch East; however, this list may also include birds occurring
outside this area’s FWS office jurisdiction. Of the 22 listed bird species six are listed as potential year-
round species, one potential wintering species, and 15 as potential breeding only species. Breeding
migratory birds do receive statutory protection; however, the site contains very few if any trees. There
is potential for vegetation to be reestablished along the banks of the Jimmy Camp Creek East Tributary
which could potentially introduce additional bird habitat.
Rare Species
A review of rare species and critical habitats within the project area was completed using the U.S. Fish
and Wildlife Service’s IPaC mapper and website (https://ecos.fws.gov/ipac/). The mapper indentifies
species either threatened, endangered, proposed and candidate species, as well as proposed and final
designated critical habitat within the project areas. Per the IPaC mapper, there are a total of 11
threatened, endangered, or candidate species on the species list; however, many of these species exist
in another geographical area or exist with bodies of water of which this parcel has no water present.
However, the report also indicates that there are no critical habitats within the project area and
therefore no rare or threatened species were found to be present on the site. Currently, the east
tributary does not contain suitable habitat for the Preble’s Mouse based on information provided by the
US Fish & Wildlife Service when reviewing the Pioneer Landing 2 site in 2014. Below is information
provided by the service in an email dated June 16, 2014:
“…..the proposed project area is immediately to the south of the Service's block clearance zone for the
Preble's in the Colorado Springs metropolitan area. Urban development and other activities likely
extirpated the Preble's from this block clearance zone.
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Based on the information that you provided, the Service continues to agree that the proposed project is
not likely to impact the Preble's. We base this determination largely on the lack of suitable riparian and
upland Preble's habitats within the proposed project area and along Jimmy Camp Creek within 0.5 mile
to the west. Additionally, there are no interconnections of suitable habitats between the proposed
project area and occupied Preble's habitats located more than 10.0 miles to the north at Monument
Creek.”
Wetlands
There are no jurisdictional wetlands found on site or within the Jimmy Camp Creek East Tributary as
determined during the 404 permit process acquired to complete the existing channel improvements
discussed above. A previous application, approval and monitoring of the 404 Permit for this area,
Permit #2002 00701, was completed in 2006. A copy of the application and reports has been included
with the submittal. In addition, a search of the US Fish and Wildlife Service National Wetlands Inventory
mapper website (https://www.fws.gov/wetlands/) didn’t indicate any jurisdictional wetlands. However,
the site does contain the presence of Freshwater Emergent Wetlands within the east tributary north of
Fontaine Blvd. Per the wetlands mapper, these emergent wetlands are coded as (PEM), Palustrine
emergent herbaceous march, fen, swale and wet meadow. A LOMR/ CLOMR will be submitted for
review and approval by the necessary agencies in order to revise the floodplain limits as needed. The
recommended creek improvements will be implemented as necessary with any required wetland
mitigation will be determined during the LOMR/ CLOMR and 404 Permit Process. As part of the initial
404 application, a report was completed in 2006 for all of Lorson Ranch which included portions of the
Jimmy Camp Creek East Tributary. This report echoes much of the same information recently
discovered and has been included for reference.
The coding is described as follows: “The (P) Palustrine System includes all nontidal wetlands dominated
by trees, shrubs, persistent emergents, emergent mosses or lichens, and all such wetlands that occur in
tidal areas where salinity due to ocean-derived salts is below 0.5 ppt. It also includes wetlands lacking
such vegetation, but with all of the following four characteristics: (1) area less than 8 ha (20 acres); (2)
active wave-formed or bedrock shoreline features lacking; (3) water depth in the deepest part of basin
less than 2.5 m (8.2 ft) at low water; and (4) salinity due to ocean-derived salts less than 0.5 ppt.” In
addition, the Emergent Classe (EM) “is characterized by erect, rooted, herbaceous hydrophytes,
excluding mosses and lichens. This vegetation is present for most of the growing season in most years.
These wetlands are usually dominated by perennial plants.”
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