Benchmark

3U7 · Augusta, MT · Non-towered · Print kneeboard · Open on the map

Elevation

5,434 ft MSL

Longest runway

6,000 ft 12/30

Runway

Mag var

18E

CTAF 122.9

Nearby now

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Weather

METAR observed

No weather station at 3U7. Nearby reporting stations: KCII (35 NM), KMSO (60 NM), KGTF (61 NM).

TAF forecast

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Sun & FAA night2026-09-18 · night begins 08:09 PM

Event	Local (MDT)	UTC
Morning civil twilight Loggable night ends	06:42 AM	12:42Z
Sunrise	07:13 AM	13:13Z
Sunset	07:38 PM	01:38Z
Evening civil twilight Loggable night begins	08:09 PM	02:09Z

Loggable night (§1.1)

08:09 PM → 06:42 AM

Night currency (§61.57)

08:38 PM → 06:13 AM

Plan a flight from 3U7

Destination

TAS (kt)Burn (gph)Reserve (hr)Cruise (ft)Max alt (ft)Wind from (°)Wind (kt)

Winds aloft NOAA forecast · 3,000 to 53,000 ft

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Full reports: nearest reporting station

Advisories

NOTAMs · Loading NOTAMs…

Pilot reports · Loading PIREPs…

Airspace hazards · Checking SIGMETs and G-AIRMETs…

Temporary flight restrictions · Checking for TFRs…

Runways

RWY 12LEFT traffic

Heading: 122° mag · 140° true
Dimensions: 6,000 × 100 ft
TPA: 6,400 ft MSL (≈1,000 AGL) · standard
Surface: Asphalt
CTAF: 122.9

Enter the left downwind (heading 302°) on the 45° at 6,400 ft MSL (≈1,000 AGL).

More details — RWY 12

Threshold elev: 5,316 ft
Markings: basic
Approach obstacle: Trees, 39 ft, 372 ft from threshold, 0 ft B of centerline — 4:1 slope to clear · penetrates the 20:1 visual approach surface

Condition: Poor. Weight bearing: Single wheel 45k, Double wheel 80k, Dual tandem 140k.

Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: FAA runway-end coordinates

Will it fit? Your aircraft's required runway length (from the POH) — checked against every runway here

ft · ≥1.5× comfortable, under 1.25× tight · saved across airports

Runway	Length	Your margin
12/30	6,000 ft

Prefer one flat page? Full runway details for 3U7 → · New to pattern entries? The 45° entry, explained → · Teaching here? Print the 3U7 kneeboard →

Comms & NavAids

Communication frequencies

Taxi & takeoff

CTAF

122.9

Source: FAA NASR (current 28-day cycle).

Prefer one flat list? All 3U7 frequencies →

Charts & procedures

PDF ↗

Chart Supplement ↗

VFR sectional →

Airport info

Airport information

FAA LID: 3U7
Coordinates: 47.4820, -112.8723
Elevation: 5,434 ft MSL
Magnetic variation: 18E
Sectional chart: GREAT FALLS
Airport use: Public
Control tower: No
ARTCC: SALT LAKE CITY (ZLC)
Flight service (FSS): GREAT FALLS · 122.3 · 1-800-WX-BRIEF
NOTAM facility: GTF
Attendance: UNATNDD
Segmented circle: Yes
Wind indicator: yes
Activated: 1965/03
Distance from city: 19 W

Night operations

Pilot-controlled lighting: Usually keyed on CTAF 122.9 — confirm the click sequence in the Chart Supplement ↗

FAA night windows (civil twilight, loggable night §1.1, currency §61.57) are under Sun & FAA night in the Weather section.

Services fuel · repairs · oxygen · attendance

Parking: tiedowns

Ownership & management 2 contacts

Owner

U S FOREST SERVICE

LEWIS & CLARK NATNL FOREST, CHOTEAU, MT

406-791-7700

Manager

BJORN TROBERG

HELENA & LEWIS & CLARK NAT FORESTS, 2880 SKYWAY DRIVE, HELENA, MT

(406) 495-3832

Remarks FAA · 12 notes

General

SNOW REMOVAL NA.
MTS PARL E & W; IN TRSN SFC.
SVCS NA.
FONE NA; CABIN 1 MI NW.
FOR CD CTC SALT LAKE ARTCC AT 801-320-2568.

Runways

PSBL MOD-SVR CROSSWIND & TURB.
RISES UPHILL 120 FT; RISING TRRN BYD.
RCMDD DEP COND PMTG.
LRG CRACKS & WEEDS FULL LEN.

Obstructions

+58 FT TREES ON CNTRLN.
+250 FT TREES ON CNTRLN.
33:1 TO THR. +65 FT TREES 0-150 FT R 2150 FT FM RWY END.

Nearby airports

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Also nearby: 3U5 Augusta (20 NM) · MT21 Lander's Fork Ranch (private) (29 NM) · 23S Seeley Lake (29 NM) · 42MT Crown Ranch Airpark (private) (31 NM) · 0S1 Meadow Creek USFS (31 NM) · 28MT Cain Ranch (private) (32 NM)

About 3U7

Benchmark (3U7) is an airport in Augusta, MT, at 5,434 ft MSL. It has 1 runway, the longest 6,000 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for 3U7, refreshed from the Aviation Weather Center and FAA NASR.

Does 3U7 have a control tower?

No. Benchmark is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM in the Comms & NavAids section.

What is the longest runway at 3U7?

Benchmark has 1 runway; the longest is 6,000 ft. See the Runways section for headings, surface, and lighting.

Where is 3U7?

Benchmark is in Augusta, MT, at an elevation of 5,434 ft MSL. Coordinates: 47.4820, -112.8723.

More about 3U7

Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open 3U7 in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.

Something here wrong or out of date? Report a data problem.