Airport information
- FAA LID
- U91
- Coordinates
- 42.3733, -115.8795
- Elevation
- 5,134 ft MSL
- Magnetic variation
- 16E
- Sectional chart
- SALT LAKE CITY
- Airport use
- Public
- Control tower
- No
- ARTCC
- SALT LAKE CITY (ZLC)
- Flight service (FSS)
- BOISE
- NOTAM facility
- BOI
- Attendance
- UNATNDD
- Segmented circle
- Yes
- Wind indicator
- yes
- Activated
- 1956/04
- Distance from city
- 0 S
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 | 05:32 AM | 11:32Z |
| Sunrise | 06:07 AM | 12:07Z |
| Sunset | 09:24 PM | 03:24Z |
| Evening civil twilight Loggable night begins | 09:59 PM | 03:59Z |
Plan a flight from U91
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 05
- Pattern
- left (turns left)
- TPA
- 6,100 ft MSL (≈1,000 AGL)
- CTAF
- 122.9
Enter the left downwind for Rwy 05 at 6,100 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).
Runway 05/23
2,750 ft × 150 ft · Dirt (Fair)- Heading
- n/a
- Traffic pattern
- Left
- Approach obstacle
- Fence, 4 ft, 50 ft from threshold, 125 ft L of centerline — 12:1 slope to clear · penetrates the 20:1 visual approach surface
- Heading
- n/a
- Traffic pattern
- Left
| Runway | Length | Your margin |
|---|---|---|
| 05/23 | 2,750 ft |
Nearby navigation aids
| NavAid | Type | Freq | Radial / Dist magnetic |
|---|---|---|---|
| LIA · Liberator | VOR | 114.90 | r169° / 36.9 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
Ownership & management
Remarks FAA
- ESTABD PRIOR TO 1959.
- NO WINTER MAINTENANCE.
- RY 05/23 SFC MAY BE POOR DUE TO DAMAGE BY LIVESTOCK; GROUND VEHICLES AND RODENTS.
- NO TELEPHONE AVBL AT ARPT.
- FOR CD CTC SALT LAKE ARTCC AT 801-320-2568.
- TIEDOWN PADS HAVE NO CHAINS.
- 05/23 EDGES & THRS MARKED WITH WHITE ROCKS.
- RY 05, 4 FT FENCE AT 90 FT ON CNTRLN; 7 FT ROAD AT 150 FT ON CNTRLN. 65 FT MARKED POWERLINE AT 900 FT ON CNTRLN.
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 U91 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 U91
Grasmere Airport (U91) is an airport in Grasmere, ID, at 5,134 ft MSL. It has 1 runway, the longest 2,750 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for U91, refreshed from the Aviation Weather Center and FAA NASR.
Does U91 have a control tower?
No. Grasmere Airport is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM on the Comms & NavAids tab.
What is the longest runway at U91?
Grasmere Airport has 1 runway; the longest is 2,750 ft. See the Runways tab for headings, surface, and lighting.
Where is U91?
Grasmere Airport is in Grasmere, ID, at an elevation of 5,134 ft MSL. Coordinates: 42.3733, -115.8795.
Fly out of U91 often?
Save U91 as your home base in the SkyReady app for a one-tap Go/No-Go readiness brief, weather alerts, and automatic FAA currency — free to log.