Atwater, California
KMER Castle
Castle (KMER) is a towered, public-use airport in Atwater, California, at 190.4 ft MSL. Its runway is 13/31 (11,802 by 150 ft, asphalt and concrete). Right traffic for runway 31. CTAF 118.175.
FAA NASR data effective Oct 29, 2026. Not for navigation; verify with current FAA charts and the Chart Supplement.
Airport
At a glance
- Identifiers
- ICAO KMER, FAA MER
- Location
- Atwater, California (Merced County). 3 NM NE of the city center
- Elevation
- 190.4 ft MSL
- Position
- 37.3805° N, 120.5682° W
- Control tower
- Yes (ATCT)
- Sectional chart
- San Francisco
- Magnetic variation
- 15° E (2000)
- Fuel
- 100LL, Jet A, Jet A-1
- Ownership
- Publicly owned, open to the public
- Attendance
- MON-FRI 0800-1700
1 runway
Runways
| Runway | Length × width | Surface | Edge lights |
|---|---|---|---|
| 13/31 | 11,802 × 150 ft | Asphalt and Concrete, good condition | High intensity |
Runway ends and traffic pattern
| End | Pattern | Glide slope lights | Instrument | Displaced threshold | Landing distance |
|---|---|---|---|---|---|
| 13 | Not stated | 4-light PAPI, left | None listed | None listed | Not listed |
| 31 | Right traffic | 4-light PAPI, left | LOC/GS | None listed | Not listed |
VHF
Frequencies
- ATIS
- 124.475
- "Castle". Hours 0700-2100
- CTAF
- 118.175
- UNICOM
- 122.95
- Tower
- 118.175
- "Castle". Hours 0700-2100
- Ground
- 133.575
- "Castle". Hours 0700-2100
- Approach / departure
- 120.95
- "Norcal"
Weather station
- AWOS-3 MER
- No frequency listed
Before you go
Brief KMER in Ascent EFB.
Current weather, NOTAMs and the airport diagram for Castle, in the app on iPhone and iPad.
Not for navigation. Verify with current FAA charts and the Chart Supplement before flight.
Source: FAA NASR 28-day subscription, cycle effective Oct 29, 2026. Airport data changes every 28 days and NOTAMs can override it at any time.