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S85
BIG SKY FLD
Public
PUB
1 miles NE of CULBERTSON, MT
View on
Map
Status
Operational
Coordinates
48° 09' 13"N
104° 30' 15"W
Elevation
1953' MSL
Pattern Alt
2953' MSL
Mag Variation
13E
Fuel
100LL
FSS
GREAT FALLS (GTF)
Sectional
BILLINGS
ARTCC
SALT LAKE CITY (ZLC)
Data Effective
11/27/25-12/25/25
KPO1 (26nm)
LIFR
11:35 PM MST
RAW
Light Snow and Mist
Overcast 1,000'
Broken 200'
Viz
3sm
Temp
32°F
Dew
32°F
Pres
29.73"Hg
Wind
220° 8kts
RMK
AO2 TSNO
METAR KPO1 050635Z AUTO 22008KT 3SM -SN BR BKN002 OVC010 00/00 A2973 RMK AO2 TSNO
Services
Frequencies & Documents
Freqs & Docs
TAF
NOTAM
Operations
Runways
Remarks
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S85 FBOs
No FBOs (Fixed Base Operators) are listed for this airport.
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Business
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UNICOM
122.8
CTAF
122.8
AWOS-3
AWOS-3
406-787-5819
120.0
FAA A/FD Pages
FAA A/FD Page
Airport Diagrams
No Documents
Airport Minimums
No Documents
Departure Procedures
No Documents
Hotspot
No Documents
Standard Term. Arrival
No Documents
Instrument Approach
No Documents
Terminal Area Forecast
KSDY (30nm)
RAW
Reported
Thu, 12/4 10:20 PM MST
Valid
Thu, 12/4 11:00 PM MST - Fri, 12/5 11:00 PM MST
MVFR
Temporary
11:00 PM MST - 12:00 AM MST
Broken 1,500'
Viz
N/A
Wind
Calm
VFR
11:00 PM MST - 1:00 AM MST
Light Freezing Rain and Snow
Overcast 5,000'
Scattered 1,500'
Viz
6sm
Wind
290° 8kts
LIFR
1:00 AM MST - 5:00 AM MST
Light Snow
Overcast 400'
Viz
2sm
Wind
Calm
IFR
1:00 AM MST - 7:00 AM MST
Overcast 900'
Viz
6sm
Wind
290° 9kts
MVFR
7:00 AM MST - 3:00 PM MST
Overcast 2,200'
Scattered 1,800'
Viz
6sm
Wind
320° 10kts
Gusts 20kts
MVFR
3:00 PM MST - 11:00 PM MST
Broken 1,300'
Viz
6sm
Wind
340° 8kts
TAF KSDY 050520Z 0506/0606 29008KT 6SM -FZRASN SCT015 OVC050
TEMPO 0506/0507 BKN015
FM050800 29009KT P6SM OVC009
PROB30 0508/0512 2SM -SN OVC004
FM051400 32010G20KT P6SM SCT018 OVC022
FM052200 34008KT P6SM BKN013
S85
Effective
Expires
Category
NOTAM
Domestic
11/25/25
0717Z
12/10/25
0617Z
!GTF 11/095 S85 OBST TOWER LGT (ASR 1292699) 481225.70N1043146.90W (3.4NM NNW S85) 2710.6FT (319.9FT AGL) U/S 2511250717-2512100617
ATC Tower
No
Attendance
UNATNDD
ON CALL ALL HOURS 406-787-6680/0660.
Owner
ROOSEVELT COUNTY & CITY
210 BROADWAY
CULBERTSON, MT 59218
Phone: 406-787-5271
Manager
ROBERT JASPER
BOX 351
CULBERTSON, MT 59218
Phone: 406-787-5271
FSS
GREAT FALLS FSS (GTF)
Toll Free: 1-800-WX-BRIEF
NOTAM
GTF
Light Schedule
--
Lights
ACTVT MIRL RY 08/26 & PAPI RY 26 - CTAF.
Beacon
N/A
Wind Indicator
Yes - Lighted
Segmented Cir.
Yes
Landing Fee
No
Parking
Tie-Down
Int'l Operations
NOT a Landing Rights Airport
NOT an Airport of Entry
Airframe Repair
None
Pwrplant Repair
None
Bottled Oxygen
None
Bulk Oxygen
None
Other Services
Crop Dusting
Air Ambulance
Annual Surveying
Runway 08/26
Dimensions
3800 ft. x 60 ft.
Surface Type
ASPH
Surface Cond
Excellent
Treatment
NONE
Rwy Edge Lgts
MED
Pavement Class
Single Wheel
12,000lbs
Double Wheel
--
Double Tandem
--
Dual Dbl Tand
--
Runway 08
Runway 26
True Heading
90°
270°
Traffic Pattern
Left
Left
Markings
BSC
BSC
Markings Condition
GOOD
GOOD
Latitude
48° 09' 13"N
48° 09' 13"N
Longitude
104° 30' 43"W
104° 29' 47"W
Elevation
1,953'
1,934'
Threshold Crossing Height
--
27 ft. AGL
Visual Glide Path Angle
--
3°
Visual Slope Indicator
--
P2L
Approach Lights
Centerline Lights
Runway End Identifier Lights
A110-1
FOR CD CTC SALT LAKE ARTCC AT 801-320-2568.
A110-2
2,876 FT TWRS 3.5 MIS NW.
BIG SKY FLD (IATA: S85) is a public airport located in CULBERTSON, MT.
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