KIRO AM710, Seattle’s Original 50,000 Watt Powerhouse, is 80 Years Old


KIRO Radio officially went on the air 80 years ago with help from Franklin Delano Roosevelt’s Vice President John Nance Garner. (Contributed)

Much fretting goes on nowadays about the future of traditional broadcast radio. Appliances are changing, and the old-school radio that used to be a fixture in kitchens, cars and pocket transistors has morphed rapidly into smartphones and Wi-Fi devices.

Though the future of broadcast is murky, the roots of what’s now consumed as KIRO Radio on multiple platforms (including radios) is clear, and is celebrating a big milestone this week.

In a nearly hidden basement at 4th and University Street in downtown Seattle, KIRO Radio officially went on the air 80 years ago with help from Franklin Delano Roosevelt’s Vice President John Nance Garner.

Vice President Garner and other dignitaries were on hand in the Cobb Building at 5 p.m. on Oct. 15, 1935 when KIRO boosted its power from 250 to 500 watts. Earlier that day, KIRO became the new call-letters for a station formerly known as KPCB. The “PCB” stood for “Pacific Coast Biscuits,” flagship product of Seattle’s Centennial Flour Mills. Local businessman and politically well-connected U.S. Customs official Saul Haas bought the station from Centennial executive Moritz Thomsen and set about making big changes right away.

Radio broadcasting was still a relatively new phenomenon in 1935, and Haas set his sights on making KIRO a powerhouse. From 500 watts, KIRO ultimately beat every other station in the Northwest and, with permission from the Federal Communications Commission, went to 50,000 watts during the summer of 1941. To accomplish the boost, KIRO built a glamorous new transmitter building and antenna array on Vashon/Maury Island.

When the U.S. entered World War II later that year, the government froze all pending power boosts for radio stations, leaving KIRO the only 50,000-watt powerhouse west of the Twin Cities and north of San Francisco for the next five years. The nighttime signal went as far as Alaska and northern California.

During World War II, KIRO carried most of CBS’ most famous broadcasts, including Edward R. Murrow reporting from London, and other correspondents covering the war in Europe and the Pacific. KIRO also made recordings of those famous broadcasts, and saved them at the Vashon transmitter site. A University of Washington professor named Milo Ryan discovered the collection in the 1950s, and the entire treasure trove of audio history now resides in the National Archives. Many recordings of famous World War II broadcasts exist only because KIRO saved them.

The other major milestone in KIRO’s history was the move to the news radio format in 1974, followed soon after by the securing of rights to Seahawks’ broadcasts for the team’s inaugural season in 1976. Personalities including Pete Gross, Jim French, Bill Yeend and Wayne Cody were among the most recognizable voices on KIRO from the 1970s to the 1990s, along with play-by-play for the Sonics by Bob Blackburn and then Kevin Calabro, and Dave Niehaus and Rick Rizzs for the Mariners (unlike the Seahawks, the Sonics and the Mariners weren’t always with KIRO over the years).



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