Career
He competed in distance events, both racewalking and running, at the 1904, 1908 and 1912 Olympics and at the 1906 Intercalated Games. An announcement in the August 6, 1904 issue of The New York Times indicated that the Metropolitan Association of the Amateur Athletic Union would hold a "special five-mile race" at Celtic Park on August 13, 1904 with the eight top finishers receiving a paid trip to compete in the marathon at the Olympic Games in Saint Louis on August 30, 1904. Bonhag, listed as representing the Greater New York Irish Athletic Association, was named as one of 19 "probable competitors" in the event.
At the 1904 Summer Olympics he competed in 800 m running but his result is unknown.
At the 1906 Intercalated Games he placed fourth over 5 miles and sixth over 1500 m. This was the only time he competed in this event, and the first walking race at Olympics.
The rules were not clearly set, and many of the nine competitors, including Bonhag, were "skipping" (ie changing to half-running). The first two finishers, Robert Wilkinson and Eugen Spiegler were disqualified for skipping.
A re-walk was set up between Bonhag and Don Linden, who finished fourth.
Bonhag did not show up at the re-walk, and for uncertain reasons the jury did not change the race results and gave the gold medal to Bonhag and silver to Linden. Bonhag also participated in the 3200 m steeplechase event, but was eliminated in the first round. He also participated in the individual cross country contest.
As he was one of three Americans who did not finish the race, his team was unplaced.
Bonhag also competed in the exhibition baseball tournament at the 1912 Olympics.