3W7 · Grand Coulee Dam Airport

ELECTRIC CITY, WASHINGTON · SMALL AIRPORT

1,588

Elevation ft

Runway

4,199

Longest ft · 03/21

47.92N

119.08W

Grand Coulee Dam Airport serves Electric City, Washington at 1,588 ft elevation with its longest runway, 03/21, at 4,199 by 75 ft. The figures below are computed from FAA NASR runway data (via OurAirports) and the same rules of thumb JetDesk uses on the airport page in the app; the POH and current NOTAMs are the authority.

Open 3W7 in JetDesk: live METAR, TAF, winds and runway verdict →

01Runways

Runway	Length × width	Surface	Lighting
03/21	4,199 × 75 ft	asphalt	lit

02Density altitude and turboprop runway margins

Standard temperature at 1,588 ft is about 12°C. Every 1,000 ft of density altitude adds roughly 8 percent to a turboprop's takeoff distance and 5 percent to its landing distance. The table uses Piper Meridian book numbers (2,438 ft takeoff and 2,110 ft landing over a 50 ft obstacle at sea level, ISA, max weight) as a reference airplane; heavier turboprops and light jets scale the same way from their own POH figures.

Conditions	Density altitude	Takeoff est.	Landing est.	Landing × 1.5
Standard day (ISA, 12°C)	1,588 ft	2,748 ft	2,278 ft	3,416 ft
Warm day (ISA +10)	2,788 ft	2,982 ft	2,404 ft	3,606 ft
Hot day (ISA +20)	3,988 ft	3,216 ft	2,531 ft	3,796 ft
35°C afternoon	4,369 ft	3,290 ft	2,571 ft	3,856 ft

Planning aid only. Even on a 35°C afternoon the longest runway (03/21, 4,199 ft) covers a Meridian-class turboprop's landing distance with a 50 percent margin (3,856 ft needed). The percentages are a generic rule of thumb applied to one reference airplane, not certified performance data for any specific aircraft, and the runway size categories describe the runway, not your airplane's suitability. Verify with the approved flight manual before every flight.

03Nearby fields with 5,000 ft or more

Useful as alternates, as fuel stops when the price at 3W7 is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KEPH Ephrata Municipal Airport	41 nm SW	5,500 ft
KMWH Grant County International Airport	44 nm S	13,503 ft
KS52 Methow Valley State Airport	52 nm NW	5,049 ft
KEAT Pangborn Memorial Airport	55 nm SW	7,000 ft
KGEG Spokane International Airport	65 nm E	11,002 ft

04Jet A prices and FBOs at 3W7

No public API publishes FBO fuel prices, so JetDesk does not guess. Pilots and crews log the price they actually paid at 3W7, the app flags a price stale after two weeks, and the route finder ranks every field within a corridor of your route by net savings after the cost of the extra cycle. Log a price at 3W7 or read what a fuel stop actually saves.

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