RPTR FLC FLEW TOO LOW OVER NATIONAL MONUMENT.

Narrative

USING WAC CHART CF17; 25 EDITION; AUG/XX/95; WAS TOLD BY LCL PLTS TO USE RAPID CITY VOR; TRACK OUT ON 240 DEG RADIAL; MAINTAIN 6500 FT OVER PARKING LOT OF VISITOR CTR. RAPID CITY ELEVATION IS 3202 FT. DEPARTED RWY 32; EXECUTED L TURN AND INTERCEPTED 240 DEG RADIAL AT CRUISE CLB. WX WAS STILL VERY BLUSTERY AND REMAINING CLOUD FROM NIGHT BEFORE PREVENTED A STRAIGHT RUN PARALLEL TO MOUNTAIN; BUT A L TURN EBOUND AND DSNDING WAS NECESSARY. THIS IS ONE OF THE LOUDEST PISTON PWRED ACFT THE UNITED STATES MIL HAS EVER OPERATED. THE PARKING LOT WAS PASSED OVER AT 6500 FT AS INSTRUCTED BY LCL PLTS. DUE TO ITS SIZE (32000 LBS AND 80 FT WINGSPAN) THE ACFT APPEARS CLOSER. I BELIEVE THE NOISE WAS AMPLIFIED BY THE ROCK FACE OF THE CLIFF AND CRUISE/CLB PWR (36 INCHES MANIFOLD PRESSURE/2300 RPM) WAS MAINTAINED FOR SAFETY DUE TO THE BLUSTERY CONDITIONS. THE ACFT WAS IN A L-HAND TURN (IT TAKES 3 MI TO TURN AROUND AT THIS RATE) AND THE BANK ADDED TO THE NOISE BEING REFLECTED OFF OF THE CLIFF FACE; 2000 FT AWAY. SOLUTIONS: BETTER MARKING ON WAC CHART IF THIS IS A NOISE SENSITIVE AREA WITH MINIMUM ALTS/DISTANCES FOR DIFFERENT CLASSES OF ACFT. AT THE TIME WE MET ALL THE KNOWN CRITERIA. NOTHING ON WAC NOTES UNDER SPECIAL-USE AIRSPACE REFS THIS LOCATION! HOWEVER; CHEYENNE SECTIONAL HAS A SECTION 'REGS REGARDING FLTS OVER CHARTED NATIONAL PARK SCENIC AREA; NOTHING NOTED OR CHARTED ON WAC CHARTS.'