Donald D. Coski Memorial Airport
U84 · Donnelly, ID · 4,860 ft elevation · var 18E · Non-towered
Airport information
- FAA LID
- U84
- Coordinates
- 44.7255, -116.0912
- Elevation
- 4,860 ft MSL
- Magnetic variation
- 18E
- Sectional chart
- GREAT FALLS
- Airport use
- Public
- Control tower
- No
- ARTCC
- SALT LAKE CITY (ZLC)
- Flight service (FSS)
- BOISE
- NOTAM facility
- BOI
- Attendance
- UNATNDD
- Segmented circle
- No
- Wind indicator
- yes
- Activated
- 1950/10
- Distance from city
- 1 W
Weather
METAR observed
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TAF forecast
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Sun & FAA night 2026-06-21
| Event | Local (MDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 05:21 AM | 11:21Z |
| Sunrise | 05:59 AM | 11:59Z |
| Sunset | 09:34 PM | 03:34Z |
| Evening civil twilight Loggable night begins | 10:11 PM | 04:11Z |
Plan a flight from U84
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 in the live weather panel above.
Traffic pattern
- Landing
- Rwy 18
- Pattern
- left (turns left)
- TPA
- 5,900 ft MSL (≈1,000 AGL)
- CTAF
- 122.9
Enter the left downwind for Rwy 18 at 5,900 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).
Runway 18/36
2,500 ft × 125 ft · Turf (Fair)- Heading
- n/a
- Traffic pattern
- Left
- Approach obstacle
- Trees, 60 ft, 0 ft from threshold, 100 ft R of centerline
- Heading
- n/a
- Traffic pattern
- Left
- Approach obstacle
- Trees, 45 ft, 0 ft from threshold, 75 ft R of centerline
| Runway | Length | Your margin |
|---|---|---|
| 18/36 | 2,500 ft |
Nearby navigation aids
| NavAid | Type | Freq | Radial / Dist magnetic |
|---|---|---|---|
| DNJ · Donnelly | VORTAC | 116.20 | r098° / 5.5 NM |
Chart Supplement FAA A/FD
Open PDF ↗Preview Chart Supplement
VFR sectional
Services
- Bottled oxygen
- NONE
- Bulk oxygen
- NONE
- Airframe service
- NONE
- Powerplant service
- NONE
- Parking
- tiedowns
Ownership & management
Remarks FAA
- NO WINTER MAINTENANCE.
- BOTH SIDES RWY: +30-80 FT TREES.
- NO TELEPHONE AVBL AT ARPT.
- FOR CD CTC SALT LAKE ARTCC AT 801-320-2568.
- LORI CLEMENS IS THE CITY CLERK & AMGR.
- RCMD LAND RY 36 & TKOF RY 18 WHEN WIND CONDS PERMIT.
- MAY BE MOWED LESS THAN FULL WIDTH.
- 45 FT TREES AT 0 FT, 75 FT RIGHT.
- +45 FT TREES AT 0 FT 60 FT L; NMRS +20-80 FT TREES ON CNTRLN AER.
- 65 FT TREES 500 FT ON CNTRLN AER. 60 FT TREES AT 0 FT, 100 FT RIGHT.
- RY 18/36 MAY NOT BE MOWED FULL WIDTH.
Nearby airports
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 U84 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.
About U84
Donald D. Coski Memorial Airport (U84) is an airport in Donnelly, ID, at 4,860 ft MSL. It has 1 runway, the longest 2,500 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for U84, refreshed from the Aviation Weather Center and FAA NASR.
Does U84 have a control tower?
No. Donald D. Coski Memorial Airport is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM on the Comms & NavAids tab.
What is the longest runway at U84?
Donald D. Coski Memorial Airport has 1 runway; the longest is 2,500 ft. See the Runways tab for headings, surface, and lighting.
Where is U84?
Donald D. Coski Memorial Airport is in Donnelly, ID, at an elevation of 4,860 ft MSL. Coordinates: 44.7255, -116.0912.
Fly out of U84 often?
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