Question: The 1915 Oregon Agricultural Aggies football team played their home games at Bell Field in a city in central western Oregon, that is the county seat of what county?

Context articles: 1914 Oregon Agricultural Aggies football team
1912 Oregon Agricultural Aggies football team
1913 Oregon Agricultural Aggies football team
1916 Oregon Agricultural Aggies football team
1910 Oregon Agricultural Aggies football team
1915 Oregon Agricultural Aggies football team
1909 Oregon Agricultural Aggies football team
Corvallis, Oregon
1924 Oregon Agricultural Aggies football team
1911 Oregon Agricultural Aggies football team

The 1914 Oregon Agricultural Aggies football team represented Oregon Agricultural College (now known as Oregon State University) as an independent during the 1914 college football season.
 In their second season under head coach E. J. Stewart, the Aggies compiled a 7–0–2 record and outscored their opponents by a combined total of 172 to 15.
 Against major opponents, the Aggies defeated Washington State (7–0), Idaho (26–0), and USC (38–6), and played to a tie against Washington (0–0) and Oregon (3–3).
 The team played its home games at Bell Field in Corvallis, Oregon.
 James Shaw was the team captain.
The 1912 Oregon Agricultural Aggies football team represented Oregon Agricultural College (now known as Oregon State University) as an independent during the 1912 college football season.
 In their second season under head coach Sam Dolan, the Aggies compiled a 3–4 record and outscored their opponents by a combined total of 57 to 40.
 Against major opponents, the Aggies lost to Washington (3–9), Washington State (9–10), and Oregon (0–3).
 The team played its home games at Bell Field in Corvallis, Oregon.
 Tom E. May was the team captain.
The 1913 Oregon Agricultural Aggies football team represented Oregon Agricultural College (now known as Oregon State University) as an independent during the 1913 college football season.
 In their first season under head coach E. J. Stewart, the Aggies compiled a 3–2–3 record and were outscored by their opponents by a combined total of 75 to 59.
 Against major opponents, the Aggies lost to Washington (0–47), tied Oregon (10–10), and defeated Washington State (10–2) and Idaho (3–0).
 The team played its home games at Bell Field in Corvallis, Oregon.
 Otto Sitton was the team captain.
The 1916 Oregon Agricultural Aggies football team represented Oregon Agricultural College (now known as Oregon State University) in the Pacific Coast Conference (PCC) during the 1916 college football season.
 In their first season under head coach Joseph Pipal, the Aggies compiled a 4–5 record (0–2 against PCC opponents), finished in third place in the PCC, and were outscored by their opponents by a combined total of 112 to 92.
 The team played its home games at Bell Field in Corvallis, Oregon.
 Brewer Billie was the team captain.
The 1910 Oregon Agricultural Aggies football team represented Oregon Agricultural College (now known as Oregon State University) as an independent during the 1910 college football season.
 In their first and only season under head coach George Schildmiller, the Aggies compiled a 3–2–1 record and were outscored by their opponents by a combined total of 43 to 27.
 Against major opponents, the Aggies defeated Washington State (9–3) and lost to Oregon (0–12) and Washington (0–22).
 The team played its home games at Bell Field in Corvallis, Oregon.
 James Evenden was the team captain.
The 1915 Oregon Agricultural Aggies football team represented Oregon Agricultural College (now known as Oregon State University) in the Pacific Coast Conference (PCC) during the 1915 college football season.
 In their third and final season under head coach E. J. Stewart, the Aggies compiled a 5–3 record (0–2 against PCC opponents) and were outscored by their opponents by a combined total of 166 to 73.
 The team played its home games at Bell Field in Corvallis, Oregon.
 Gus Hofer was the team captain.
The 1909 Oregon Agricultural Aggies football team represented Oregon Agricultural College (now known as Oregon State University) as an independent during the 1909 college football season.
 In their first and only season under head coach Sol Metzger, the Aggies compiled a 4–2–1 record and outscored their opponents by a combined total of 54 to 44.
 Against major opponents, the Aggies lost to Oregon (0–12) and Washington (0–18).
 The team played its home games at Bell Field in Corvallis, Oregon.
 Carl Wolf was the team captain.
Corvallis is a city in central western Oregon, United States.
 It is the county seat of Benton County and the principal city of the Corvallis, Oregon Metropolitan Statistical Area, which encompasses all of Benton County.
 As of the 2010 United States Census, the population was 54,462.
 Its population was estimated by the Portland Research Center to be 55,298 in 2013.
 Corvallis is the location of Oregon State University, a large Hewlett-Packard research campus, and Good Samaritan Regional Medical Center.
The 1924 Oregon Agricultural Aggies football team represented Oregon Agricultural College (now known as Oregon State University) in the Pacific Coast Conference (PCC) during the 1924 college football season.
 In their first season under head coach Paul J. Schissler, the Beavers compiled a 3–5 record (1–4 against PCC opponents), finished in seventh place in the PCC, and were outscored by their opponents, 85 to 71.
 Millard Scott was the team captain, and Percy Locey became the first Oregon Agricultural player to appear in an East–West Shrine Game.
 The team played its home games at Bell Field in Corvallis, Oregon.
The 1911 Oregon Agricultural Aggies football team represented Oregon Agricultural College (now known as Oregon State University) as an independent during the 1911 college football season.
 In their first season under head coach Sam Dolan, the Aggies compiled a 5–2 record and outscored their opponents by a combined total of 119 to 49.
 Against major opponents, the Aggies lost to Washington (0–34) and defeated Washington State (6–0).
 The team played its home games at Bell Field in Corvallis, Oregon.
 Bird Howley was the team captain.