Imnaha, Oregon · field elev 5,594 ft
Density Altitude at Lord Flat Usfs (OR9)
From a field elevation of 5,594 ft, a typical July afternoon at Lord Flat Usfs (77 °F) raises density altitude to about 7,977 ft — solidly into the range where performance charts deserve a close read.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 19.0 | 4,259 ft | 32.7 | 5,192 ft ▲ |
| February | 21.1 | 4,404 ft | 35.9 | 5,405 ft ▲ |
| March | 27.5 | 4,841 ft | 41.4 | 5,767 ft ▲ |
| April | 33.5 | 5,245 ft | 46.4 | 6,093 ft ▲ |
| May | 43.1 | 5,878 ft | 57.2 | 6,782 ft ▲ |
| June | 50.6 | 6,363 ft | 65.8 | 7,319 ft ▲ |
| July | 57.6 | 6,807 ft | 76.6 | 7,977 ft ▲ |
| August | 56.4 | 6,732 ft | 76.6 | 7,977 ft ▲ |
| September | 48.2 | 6,209 ft | 66.6 | 7,368 ft ▲ |
| October | 37.7 | 5,524 ft | 52.2 | 6,465 ft ▲ |
| November | 26.8 | 4,794 ft | 39.0 | 5,610 ft ▲ |
| December | 18.4 | 4,217 ft | 31.1 | 5,084 ft ▲ |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for OR9
DENSITY ALTITUDE high DA
Field elevation 5,594 ft — the air behaves like 8,001 ft.
- PRESSURE ALT
- 5,596 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby Oregon fields
- O29 — Pittsburg Landing
Imnaha · elev 1,185 ft
- OR8 — Dug Bar Usfs
Imnaha · elev 1,022 ft
- O68 — Sluice Creek
Imnaha · elev 1,370 ft
- O48 — Salmon Bar
Imnaha · elev 947 ft
- 25U — Memaloose Usfs
Imnaha · elev 6,708 ft
- O62 — B & H Usfs
Enterprise · elev 4,007 ft
- 8S4 — Enterprise Municipal
Enterprise · elev 3,957 ft
- KJSY — Joseph State
Joseph · elev 4,126 ft
Frequently asked questions
How high does density altitude get at OR9 in summer?
On a typical July afternoon — around 77 °F at the nearest NOAA normals station — density altitude at Lord Flat Usfs reaches roughly 7,977 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at OR9 on an average day?
It swings with the seasons: from roughly 4,217 ft at the coldest month's average temperature to about 6,807 ft at the warmest month's — all from a constant field elevation of 5,594 ft. The month-by-month table above carries the full year.
What is the field elevation of Lord Flat Usfs?
5,594 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is OR9 (FAA), in Imnaha, Oregon.