Grand Coulee Dam traffic pattern

Pattern altitude at Grand Coulee Dam (3W7) is 2,600 ft MSL (≈1,000 AGL) by the standard convention — none is published for this field, and 22 is charted right traffic. · Open on the map

All of Grand Coulee Dam — runways, frequencies, charts and live weather

Pattern diagram

Drawn to scale from the FAA NASR runway alignments and the per end right traffic flags — pick a runway to see its pattern. Live wind picks the favored runway when 3W7 reports it.

RWY 22RIGHT trafficRP · charted

Heading: 216° mag · 231° true
Dimensions: 4,203 × 75 ft
TPA: 2,600 ft MSL (≈1,000 AGL) · standard
Surface: Asphalt
Lights: 2-light PAPI (left) (4.2°)
CTAF: 122.9

Enter the right downwind (heading 036°) on the 45° at 2,600 ft MSL (≈1,000 AGL).

More details — RWY 22

Threshold elev: 1,589 ft
Markings: nonprecision
Approach obstacle: Gnd, 30 ft, 1,195 ft from threshold, 0 ft B of centerline — 33:1 slope to clear
Threshold crossing height: 53 ft
TDZ elevation: 1,593 ft
End lights: REIL

Condition: Good. Edge lights: Med. Weight bearing: Single wheel 26k.

Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: FAA runway-end coordinates

Pattern direction by runway

Runway	Pattern	Heading	Pattern altitude
04	Left traffic	036° mag	2,600 ft MSL (≈1,000 AGL)
22	Right traffic	216° mag	2,600 ft MSL (≈1,000 AGL)

No pattern altitude is published for 3W7; the figure above is the AC 90-66B 1,000 ft AGL convention for propeller aircraft, rounded to the field. Turbine aircraft normally fly 1,500 ft AGL. Headings are the runway alignment; downwind is the reciprocal.

Flying the pattern at 3W7

Grand Coulee Dam is non towered, so the pattern is self announced on CTAF 122.9. AC 90-66B asks for a report on entry and on each leg, and for the standard 45° entry to downwind at pattern altitude.

Watch the right traffic ends here: 22. A right pattern at a field where the other end is left is the single most common place to end up pointing at opposing traffic. The full entry procedure is here →

Frequently asked

What is the traffic pattern altitude at 3W7?

Grand Coulee Dam has no traffic pattern altitude published in the FAA NASR data. The AC 90-66B convention for propeller aircraft is 1,000 ft AGL, which works out to roughly 2,600 ft MSL (≈1,000 AGL) here — but confirm it against the Chart Supplement before you fly, since a field can have a non standard pattern altitude that NASR does not carry.

Does 3W7 have right traffic?

Yes, on one runway end: 22. Every other end at Grand Coulee Dam is standard left traffic.

What frequency is the pattern on at 3W7?

Grand Coulee Dam is non towered, so pattern position reports go on the CTAF, 122.9. AC 90-66B asks for self announcing on entry and on each leg.

More about 3W7

Pattern direction and alignment are drawn from the FAA NASR (28-day cycle); the diagram is generated, not an FAA chart. Pattern altitude is shown as published where NASR carries one, otherwise as the AC 90-66B 1,000 ft AGL convention. For planning and education only; always verify against the Chart Supplement.

Something here wrong or out of date? Report a data problem.