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OVERALL DRAINAGE REPORT
MASON STREET INFRASTRUCTURE
FORT COLLINS, COLORADO
OCTOBER 4TH, 2023
NORTHERNENGINEERING.COM
970.221.4158
FORT COLLINS
GREELEY
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NORTHERNENGINEERING.COM | 970.221.4158 OVERALL DRAINAGE REPORT: MASON STREET INFRASTRUCTRE
FORT COLLINS | GREELEY COVER LETTER
October 4th, 2023
City of Fort Collins
Stormwater Utility
700 Wood Street
Fort Collins, CO 80526
RE: OVERALL DRAINAGE REPORT FOR
THE MASON STREET INFRASTRUCTRE ODP (1971-001)
Dear Staff:
Northern Engineering is pleased to submit this Final Drainage Report for your review. This report accompanies
the Overall Development Plan submittal for the Mason Street Infrastructure.
This report has been prepared in accordance with the Fort Collins Stormwater Criteria Manual (FCSCM) and
serves to document the stormwater impacts associated with the proposed Mason Street Infrastructure Overall
Development Plan. We understand the review by the City of Fort Collins is to ensure general compliance with
standardized criteria contained in the FCSCM.
If you should have any questions as you review this report, please feel free to contact us.
Sincerely,
NORTHERN ENGINEERING SERVICES, INC.
MASON RUEBEL, PE BLAINE MATHISEN, PE
Project Engineer Project Manager
NORTHERNENGINEERING.COM | 970.221.4158 OVERALL DRAINAGE REPORT: MASON STREET INFRASTRUCTRE
FORT COLLINS | GREELEY TABLE OF CONTENTS
TABLE OF CONTENTS
GENERAL LOCATION AND DESCRIPTION .......................................................... 1
DRAIN BASINS AND SUB-BASINS ..................................................................... 4
DRAINAGE FACILITY DESIGN ........................................................................... 5
CONCLUSIONS .............................................................................................. 6
REFERENCES ................................................................................................ 6
TABLES AND FIGURES
FIGURE 1 - VICINITY MAP ..................................................................................................1
FIGURE 2 - AERIAL PHOTO ................................................................................................2
FIGURE 3 - FIRMETTE MAP 08069C0977G ........................................................................3
APPENDICEX
EX1 – WATER QUAILTY EXHIBIT
MDP – DRAINAGE EXHIBIT
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FORT COLLINS | GREELEY 1 | 11
GENERAL LOCATION AND DESCRIPTION
A. LOCATION
Vicinity Map
The Mason Street Infrastructure project site is located in the southwest quarter of Section 2,
Township 7 North, Range 69 West of the 6th Principal Meridian, City of Fort Collins, County of
Larimer, State of Colorado.
The project site (refer to Figure 1) is bordered to the west by residential homes, to the north and
south by commercial businesses and to the east by a mixture of residential and commercial
businesses.
This project includes N Mason Street from Hickory Street to Hibdon Court and the surrounding
parcels. The nearest existing major streets are Hickory Street and N College Ave.
B. DESCRIPTION OF PROPERTY
The Mason Street Infrastructure project is comprised of ±13.45 acres. The project area consists
of two existing parcels surrounding Mason Street and Hibdon Court. The current owners are N
College 1311 LLC & the City of Fort Collins (refer to Figure 2).
Figure 1 - Vicinity map
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FORT COLLINS | GREELEY 2 | 11
The site is currently vacant with native grasses.
The project site is the regional drainage point for several upstream properties. The existing on-
site runoff generally drains from north to south across flat grades (e.g. <1.00%) into adjacent
properties to the south & east. There is an existing detention pond located on the Fort Collins
property that is the drainage point for the offsite basins to the north. This pond has an existing
volume of 4ac.ft. The outfall for the detention pond is conveyed through an 8” PVC pipe to the
east side of Mason Street to an existing roadside ditch and conveyed to College Ave. The
existing storm drain is currently blocked and does not connect to the storm infrastructure in
College Ave. Storm runoff collects in the offsite storm drain and spills into College Ave from two
offsite inlets in the property east of the project site. The Mason Street Infrastructure project will
maintain historical drainage patterns by routing runoff to College Ave and repairing the
connection to the existing infrastructure in College Ave. This development will provide the
interim condition for the Hickory Regional Detention Pond and maintain the existing volume
and provide any additional detention required with the development of Lot 2. The City of Fort
Collins will perform the analysis of upstream basins and flow with the design of the ultimate
Hickory Regional Detention Pond. The ultimate regional pond will also include the realignment
of the site outfall and discharge directly to the Cache La Poudre River.
According to the United States Department of Agriculture (USDA) Natural Resources
Conservation Service (NRCS) Soil Survey website:
http://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx), 83.3% of the site consists of
Nunn Clay loam (Hydrologic Soil Group C) and 16.7% of the site consists of Caruso clay loam
Figure 2 - Aerial Photo
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FORT COLLINS | GREELEY 3 | 11
(Hydrologic Soil Group D). The calculations assume a Hydrologic Soil Group C. Hydrologic Soil
Group C has a slow rate of water absorption and infiltration.
A subsurface exploration report was completed by CTL Thompson “Geotechnical Investigation
Hibdon/Mason 24/7 Shelter SWC Hibdon Court and Mason Street Fort Collins, Colorado” on
October 25, 2022 (Project No. FC10,520.000-125-R1). According to the report the site generally
consists of Sandy Clay with groundwater at roughly 8’ to 11’ depths from existing ground.
The site is currently zoned as Service Commercial District (CS) in Fort Collins. Developments to
the north, south, and east are zoned as Service Commercial as well. The west properties are
zoned as Low Density Mixed-Use Neighborhood District (L-M-N).
FLOODPLAIN
The subject property is not located in a FEMA or City of Fort Collins regulatory floodplain.
C. DESCRIPTION OF PROJECT
The project site will include the widening of N Mason Street, Right of Way dedication and the
two current parcels will be subdivided into three lots. Lot 1 (±8 acres) will be owned by the City
of Fort Collins and will be the location of the Hickory Regional Detention Pond. Lot 2 (±2.77
acres) & Lot 3 (±1.39 acres) will remain undeveloped and additional drainage and WQ design
will be required with future development.
The proposed infrastructure improvements will consist of the construction of the interim
Hickory Regional Detention Pond, overlot grading of adjacent properties, and the ultimate
alignment of Mason Street from the south property line to Hibdon Court. The road
improvements include asphalt paving, sidewalks, and landscaping.
Figure 3 - FIRMette Map 08069C0977G
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FORT COLLINS | GREELEY 4 | 11
DRAIN BASINS AND SUB-BASINS
A. MAJOR BASIN DESCRIPTION
The Mason Street Infrastructure project is located in the Dry Creek Major Basin. Dry Creek,
which is tributary to the Poudre River, extends from near the Wyoming border to where it joins
the river near Mulberry and Timberline. The Dry Creek Basin is approximately 23 miles long and
six miles wide and encompasses approximately 62 square miles. The land use in the upper and
middle portion of the basin are primarily rangeland and irrigated hay meadows and pastures.
The majority of the lower basin is developed and includes commercial, industrial, and
residential uses.
Detention requirements for this basin are to release at or below the allowable runoff rate of
0.20 cfs per acre.
B. SUB-BASIN DESCRIPTION
The existing subject site can be defined with three (3) major sub-basins that encompass the
entire project site. Historically runoff from the site overland flows to the south and east
properties. There is an existing detention pond centrally located on the site that is the main
drainage point for several upstream properties.
Runoff that is collected in the existing detention pond outfalls to an 8” PVC pipe that discharges
to a roadside ditch on the east side of N Mason Street. This ditch discharges to an existing 21”
RCP pipe that leaves the east side of the site towards N College Ave. This outfall pipe is
connected to two additional inlets in the adjacent property to the east. This outfall is currently
blocked and does not connect to the storm infrastructure in N College Ave. The Mason Street
Infrastructure project will repair the connection to the existing storm infrastructure in College
Ave and maintain the historic site outfall. An ultimate outfall for these lots and the Hickory
Regional Detention Pond will be designed and constructed by the City of Fort Collins.
The project site does receive runoff from contiguous off-site properties. This project will
propose an interim condition for the Hickory Regional Detention Pond to replace the existing
detention pond. This interim pond will maintain the existing volume and provide any additional
detention required with the development of Lot 2. Lot 3 will provide separate water quality and
detention with future development. Fort Collins will provide analysis of the upstream basins
and design of the ultimate regional Detention Pond.
C. DEVELOPMENT CRITERIA REFERENCE AND CONSTRAINTS
This project proposes to utilize existing infrastructure as the site outfall. Detention
requirements for this basin are to release at or below the allowable runoff rate of 0.20 cfs per
acre. Lots 1 & 2 will utilize the interim Hickory Regional Detention Pond and the interim release
rate. Additional volume will be provided to maintain the historic drainage point from these
properties. As discussed further in this report, the total release rate from the detention pond
will be designed with the ultimate Hickory Regional Detention Pond by the City of Fort Collins.
This project will improve the existing drainage facilities and bring the interim site outfall up to
compliance with the city code. There is a small amount of area that will not be detained and
will be taken into account with future development per the Mason Street Infrastructure Master
Drainage Plan.
Due to the elevation difference between the Hickory Pond High water elevations, separate
detention and water quality design will be required with the future development of Lot 3.
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FORT COLLINS | GREELEY 5 | 11
Runoff will bypass the interim Hickory Regional Detention Pond. This property will remain
undeveloped with this project and maintain existing conveyance. In the interim this runoff will
be routed to the existing 21” RCP storm outfall, but in the future will connect to the ultimate
Hickory Pond outfall designed by the City of Fort Collins.
The site plan is constrained on all sides by developed properties and public roads. Existing
elevations along the property lines will be maintained.
The existing 21” RCP storm drain will function as the interim outfall for the project site. The
connection from the 21” RCP to storm infrastructure in N College Ave will be replaced to
provide positive drainage and repair any blocked or damaged pipes.
DRAINAGE FACILITY DESIGN
A. GENERAL CONCEPT
The main objective of this drainage design is to maintain existing drainage patterns and to not
adversely impact downstream infrastructure.
There is notable off-site runoff that passes directly through the project site. It will not be
accounted for with the interim drainage design, but this project does improve the existing
drainage facilities onsite. Analysis of the upstream basins and flow will be required by the City
of Fort Collins with the design of the ultimate Hickory Regional Detention Pond. With the
development of the Mason Street Infrastructure, the interim regional pond will be sized as large
as possible based on lot size and the outfall elevation.
Detention for Lots 1, 2 and a portion of N Mason Street will be provided in the Hickory Regional
Detention Pond. Lots 2 will be required to provide onsite LID treatment and any additional
standard water quality treatment will be provided in the regional pond. Detention, water
quality treatment, and LID for Lot 3 will be provided separately and bypass the interim Hickory
Regional Detention Pond. Lots 3 will also be required to treat and detain runoff along the
adjacent Mason Street or Hibdon Court frontage.
Drainage for the overall project site has been analyzed using four (4) Major Drainage Basins.
These basins are detailed in the Master Drainage Plan and the drainage patterns anticipated for
the basins are further described below.
Sub-Basin 1 will be the location of the Hickory Regional Detention Pond and will provide
detention and standard water quality for Lot 2 and off-site upstream properties. Runoff from
this basin will utilize the existing 21”RCP storm drain in the southeast corner of the property.
This interim outfall will be replaced to provide positive drainage. With the design of the
ultimate regional pond, an ultimate outfall will be designed and constructed by the City of Fort
Collins.
Sub-Basin 2 encompasses Lot 2 and a portion of Mason Street. LID will be required with the
future development of Lot 2 and the Mason Street frontage. Runoff from this sub-basin will be
discharged to the Hickory Regional Detention Pond. The regional pond will provide detention
and standard water quality for sub-basin 2.
Sub-Basin 3 encompasses Lot 3 and a portion of Mason Street & Hibdon Court. Due to the
elevation difference with the highwater elevation of the regional pond separate detention,
water quality and LID will be required with the future development of Lot 3. This sub-basin will
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FORT COLLINS | GREELEY 6 | 11
utilize the 21” RCP storm drain as the interim storm outfall and will be re-routed with the
ultimate Hickory Regional Pond outfall.
Sub-Basin 4 encompasses a small portion of Lot 1 and the east side of Mason Street. This basin
will remain undeveloped and will be the main conveyance path for upstream basins to the 21”
RCP storm drain and site outfall.
B. CONFORMANCE WITH WATER QUAILTY TREATMENT CRITERIA
The Hickory Regional Detention Pond will provide standard water quality treatment for Lots
1, 2 and a portion of N Mason Street. Lot 3 will require separate detention and standard
water quality treatment that will bypass the regional pond. Per city code, 100% of runoff
from the project site will be required to receive some sort of water quality treatment with
the future development of Lots 2 & 3.
C. CONFORMANCE WITH LOW IMPACT DEVELOPMENT (LID)
The future development of Lots 2 & 3 will conform with the requirement to treat a minimum of 75%
of newly or modified impervious area, including the Mason Street and Hibdon Court frontage, using
an LID technique. Lot 1 will remain the Hickory Regional Detention Pond and there will be no
impervious area proposed with this lot.
CONCLUSIONS
A. COMPLIANCE WITH STANDARDS
The drainage design proposed for the Mason Street Infrastructure project complies with the
City of Fort Collins Stormwater Criteria Manual as well as the associated master drainage plan.
There are no City or FEMA 100-year regulatory floodplains associated with the Mason Street
Infrastructure development.
The drainage plan and stormwater management measures proposed with the Mason Street
Infrastructure project are compliant with all applicable State and Federal regulations governing
stormwater discharge.
B. DRAINAGE CONCEPT
The drainage design proposed with this project will ensure that all downstream infrastructure
is not adversely impacted by this development. All existing downstream drainage facilities are
expected to not be impacted negatively by this development.
The Mason Street Infrastructure overall development project will not impact the Master
Drainage Plan recommendations for the Dry Creek Major Drainage Basin.
The drainage design will improve existing drainage facilities and bring onsite and immediate
offsite storm infrastructure into compliance with the current Fort Collins
REFERENCES
1. Fort Collins Stormwater Criteria Manual, City of Fort Collins, Colorado, adopted by Ordinance No.
159, 2018, and referenced in Section 26-500 of the City of Fort Collins Municipal Code.
2. Soils Resource Report for Larimer County Area, Colorado, Natural Resources Conservation Service,
United States Department of Agriculture.
3. Geotechnical Investigation Hibdon/Mason 24/7 shelter SWC Hibdon Court and Mason Street Fort
Collins, Colorado, CTL Thompson, Fort Collins, Colorado, October 2022
NORTHERNENGINEERING.COM | 970.221.4158 PRELIMINAY DRAINAGE REPORT: MASON STREET INFRASTRUCTRE
FORT COLLINS | GREELEY APPENDIX
APPENDIX
EX1 – WATER QUAILTY EXHIBIT
MDP – DRAINAGE EXHIBIT
ELEC
FES
M VAULTELEC
CABLE ELEC
X
CT
V
CT
V
CTVCTV
OHU
XXXX
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CTVCTVCTVGGG
SS SS SS
H2O H2O
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H Y D
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W W W W W W W W W
XXXXXX
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X
X
X
X
W W W W W W W W W
X
W W
D
7.79 ac.
1
2.77 ac.
2
0.35 ac.
4
1.32 ac.
3
LOT 1
HICKORY REGIONAL
DETENTION POND
LOT 2 LOT 3
TRACT A
HIBDON COURT
N
M
A
S
O
N
S
T
R
E
E
T
SITE OUTFALL
LOCATION
STORM DRAIN
STORM DRAIN
DRAWN BY:
SCALE:
DATE:
WQ EXHIBIT
SHEET NO:
FORT COLLINS: 301 North Howes Street, Suite 100, 80521
GREELEY: 820 8th Street, 80631
E N G I N E E R N GI
EHTRON R N
970.221.4158
northernengineering.com
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MASON STREET INFRASTRUCTURE
FORT COLLINS
COLORADO
MCR
1" = 100'
10/04/2023
EX1
PROPOSED STORM SEWER
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
PROPOSED INLET
ADESIGN POINT
DRAINAGE BASIN LABEL
DRAINAGE BASIN BOUNDARY
A
LEGEND:
FOR DRAINAGE REVIEW ONLY
NOT FOR CONSTRUCTION ( IN FEET )
1 inch = ft.
Feet0100100
100
LOT 1 (BASINS 1)
·STANDARD WATER QUALITY
AREA OF WATER QUALITY RESPONSIBILITY
LOT 2 (BASIN 2)
·LOW IMPACT DEVELOPMENT
LOT 3 (BASIN 3)
·STANDARD WATER QUAILITY
·LOW IMPACT DEVELOPMENT
XX X
X
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X
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SS
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SS
SS
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ELEC
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EXISTING OWNER: NORTH
COLLEGE 1311 LLC
OWNER: VALLEY
STEEL & QR INC
(C-S DISTRICT)
OWNER: NORTH
COLLEGE 1311 LLC
(C-S DISTRICT)
OWNER: HOYT JOHN R
(C-S DISTRICT)
OWNER: THOMPSON
PROPERTIES LLC
(C-S DISTRICT)
OWNER: D AND S
MOTELS INC
(C-S DISTRICT)OWNER: WOOD RONALD
G/JENNIFERL/WILLARD E
(C-S DISTRICT)
OWNER: WANKIER LANCE
(C-S DISTRICT)
OWNER: STONECREST INC
(C-S DISTRICT)
OWNER: R AND S
HOLDINGS LLC
(C-S DISTRICT)
OWNER: VALLEY STEEL &
WIRE SUBDIVISION
(C-S DISTRICT)
OWNER:HAINES BRANDON KUHRT
MUSTANG SUBDIVISION
(C-S DISTRICT)
HICKORY STREET
HIBDON COURT
N
M
A
S
O
N
S
T
R
E
E
T
N
M
A
S
O
N
S
T
R
E
E
T
EXISTING OWNER: CITY OF
FORT COLLINS
R.O.W AGREEMENT WITH UNION
PACIFIC RAILROAD FOR THE PURPOSE
OF IRRIGATION DITCH & IRRIGATION
WATER UNSPECIFIED WIDTH
AGREEMENT
BK 813 PG 27
UNI
O
N
P
A
C
I
F
I
C
R
A
I
L
R
O
A
D
OWNER: NORTHERN COLORADO
FEEDERS SUPPLY SUB., 1ST
(C-S DISTRICT)
OWNER: GINKY TRUST
(L-M-N DISTRICT)
N
C
O
L
L
E
G
E
A
V
E
N
U
E
OWNER: R AND S
HOLDINGS LLC
(C-S DISTRICT)
EXISTING
PROPERTY LINE
TO BE VACATED EXISTING
PROPERTY LINE
TO BE VACATED
C-S DISTRICT
HICKORY REGIONAL
DETENTION POND
±7.79 ACRES
C-S DISTRICT
±2.77 ACRES
C-S DISTRICT
±1.32 ACRES
EXISTING OWNER: NORTH
COLLEGE 1311 LLC
2
7.79
1
EXISTING SITE
OUTFALL
EXISTING DETENTION
POND OUTFALL
EXISTING
CULVERT
EXISTING STORM
DRAIN2.77 ac.
2
1.32 ac.
3
1
3
EXISTING IRRIGATION
DITCH
DETENTION POND
DETENTION POND
DETENTION POND
20' WATERLINE AND
ROW EASEMENT
REC. NO. 85040113
20' UTILITY EASEMENT BK
1430 PG 930
20' UTILITY
EASEMENT PER
PLAT OF BREW SUB.
FIRST FILING
RIGHT OF WAY EASEMENT
BK 929 PG 30
(WIDTH VARIES)
6' UTILITY
EASEMENT
BK 1658 PG 746
6' UTILITY
EASEMENT PER
PLAT OF BREW SUB.
FIRST FILING
EXISTING 10' UTILTIY
EASEMENT
BK 1658 PG 746
3' POWER LINE EASEMENT
TO CITY OF FORT COLLINS
BK 1475 PG 941
45' ROW
BK 1743 PG 632
10' UTILITY
EASEMENT
BK 1572 PG 322
45' ROW
BK 1743 PG 632
10' UTILITY
EASEMENT
BK 1572 PG 321
30' UPRR TRACK EASEMENT
BOOK 2027 PAGE 988
REC. NO. 98091992 &
REC. NO. 20060019203
D
R
Y
C
R
E
E
K
EXISTING STORM
INLETS
SECTION LINE
SECTION LINE
LOT 2
LOT 1
LOT 3
30' UPRR TRACK EASEMENT
BOOK 2027 PAGE 988
REC. NO. 98091992 &
REC. NO. 20060019203
NON-EXCLUSIVE
ACCESS EASEMENT
REC. NO. 20140030921
53.5' PERPETUAL EASEMENT FOR
ELECTRIC POWER TRANSMISSION LINE
BK 923 PG 282
24' ACCESS EASEMENT
REC. NO. 20140036292
20 IRRIGATION DITCH
EASEMENT
BK 1429 PG 750
30 EASEMENT FOR ROAD PURPOSES
BK 1143 PG 187
(EXCEPTION PARCEL PIB FCIF25205400)
20 RIGHT OF WAY EASEMENT
BK 1114 PG 555
6' UTILITY EASEMENT
REC. NO. 2006-0068858 &
REC. NO. 2006-0068859
20' UTILITY EASEMENT
PER VALLEY STEEL &
WIRE SUBDIVISION PLAT
INTERIM SITE
OUTFALL
RAIN
GARDEN
RAIN
GARDEN
RAIN
GARDEN
DETENTION
POND
EXISTING DETENTION
POND
0.35
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EXISTING
CULVERT
S
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4
EXISTING 36"
WATER LINEEXISTING 36"
WATER LINE
ST
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TO EXISTING
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ULTIMATE HICKORY
REGIONAL DETENTION
POND OUTFALL
TRACT A
PROPOSED
NATURAL
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ZONE
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c
.
N
O
T
F
O
R
C
O
N
S
T
R
U
C
T
I
O
N
R
E
V
I
E
W
S
E
T
NO
R
T
H
M
A
S
O
N
S
T
R
E
E
T
OV
E
R
A
L
L
D
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CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what's below.
before you dig.Call
R
NORTH
( IN FEET )
0
1 INCH = 60 FEET
60 60 120 180
LEGEND:
NOTES:
1.ALL PROJECT DATA IS ON THE CITY OF FORT COLLINS VERTICAL DATUM; NAVD88.
SEE OVERALL DEVELOPMENT PLAN FOR BENCHMARK REFERENCES.
2.ACCESS POINTS SHOWN ON THE ODP ARE APPROXIMATE. EXACT LOCATIONS TO BE
DETERMINED DURING THE PDP PROCESS. TWO POINTS OF FIRE ACCESS HAVE BEEN
PLANNED TO SERVICE DEVELOPMENT.
3.PLANNING AREA ACREAGE AND BOUNDARIES ARE PRELIMINARY AND SUBJECT TO
CHANGE WITH DETAILED PLANNING.
5.PLEASE SEE SECTION 3.4.1 OF THE LAND USE CODE FOR ALLOWABLE USES WITHIN
THE NATURAL HABITAT BUFFER ZONE
6.REFER TO ODP AND OVERALL DRAINAGE REPORT FOR ADDITIONAL INFORMATION.
C
3
Phasing Schedule
Drainage Phasing Schedule
Phase Description Required Improvement
Mason Street Infrastructure Interim Hickory Regional Detention Pond, Interim Standard Water Quailty & Reconstruction of Offsite Storm Outfall
Lot 1 Ultimate Hickory Regional Pond sizing and outfall
Lot 2 Low-Impact Development
Lot 3 Detention & Low-Impact Development
Tract A (City Owned)n/a
Site Phasing Schedule
Phase Description Required Improvements
Mason Street Infrastructure Mason St. (42'FL-FL & 6' West Sidewalk)
Lot 1 n/a
Lot 2 n/a
Lot 3 Hibdon Ct. (Ultimate Street Section) & Mason St. (6' East Sidewalk)
Tract A (City Owned)Mason St. (6' East Sidewalk)