The makings of a t1 school are like a long tradition of serious winning (national and conference titles), a huge fan base, national media coverage on a regular basis, awesome facilities, and a ton of money to pour into the program. It's a rather arbitrary term of course.
This is probably a good rough estimate
http://www.cfbdatawarehouse.com/data...m_rankings.php
Through whatever made up ranking components they threw together it produces a list that is probably a decent rule of thumb, I wouldnt' get hung up on individual order, but just the general neighborhood a team is in. It also is counting all of time equally, so programs that became powerhouses only recently (like within the past few decades) are probably lower than they should be, teams like Florida, FSU, Miami, etc. It's like the entire state of Florida didn't discover football till the 80's. Programs that were powerhouses for along time but have fallen off are probably too high, but whatever.
1 Alabama
2 Notre Dame (IN)
3 Southern California
4 Oklahoma
5 Michigan
6 Ohio St.
7 Texas
8 Nebraska
9 Louisiana St.
10 Tennessee
11 Georgia
12 Penn St.
13 Florida
14 Miami (FL)
15 Georgia Tech
16 Auburn (AL)
17 Minnesota
18 Washington
19 Pittsburgh (PA)
20 Texas A&M
21 Florida St.
22 Arkansas
23 UCLA
24 Michigan St.
25 Illinois
26 Wisconsin
27 Stanford (CA)
28 Iowa
29 Mississippi
30 Texas Christian
31 California
32 Princeton (NJ)
33 Clemson (SC)
34 Yale (CT)
35 Missouri
36 Purdue (IN)
37 Pennsylvania
38 Syracuse (NY)
39 Colorado
40 Army (NY)
41 Oregon
42 Harvard (MA)
43 Northwestern (IL)
44 Baylor (TX)
45 Navy (MD)
46 North Carolina
47 Vanderbilt (TN)
48 Mississippi St.
49 Kansas
50 Southern Methodist (TX)
51 Rice (TX)
52 Kentucky
53 Indiana
54 Tulane (LA)
55 Duke (NC)
56 Maryland
57 Cornell (NY)
58 Oregon St.
59 Washington St.
60 Virginia Tech
61 West Virginia
62 Oklahoma St.
63 Dartmouth (NH)
64 South Carolina
65 Texas Tech
66 Boston College (MA)
67 Virginia
68 North Carolina St.
69 Iowa St.
70 Kansas St.
71 Houston (TX)
72 Brown (RI)
73 Arizona
74 Arizona St.
75 Colgate (NY)
76 Wake Forest (NC)
77 Grambling St. (LA)
78 Rutgers (NJ)
79 Columbia (NY)
80 Lafayette (PA)
81 Air Force (CO)
82 Florida A&M
83 Tulsa (OK)
84 Holy Cross (MA)
85 Lehigh (PA)
86 Southern Mississippi
87 Utah
88 Tennessee St.
89 Brigham Young (UT)
90 Southern (LA)
91 Boise St. (ID)
92 Bucknell (PA)
93 Delaware
94 Villanova (PA)
95 Furman (SC)
96 North Dakota St.
97 Cincinnati (OH)
98 Georgia Southern
99 Temple (PA)
100 San Diego St. (CA)
101 Memphis (TN)
102 Louisville (KY)
103 Louisiana Tech
104 Miami (OH)
105 Hawaii
106 Fordham (NY)
107 William & Mary (VA)
108 Appalachian St. (NC)
109 Georgetown (DC)
110 Jackson St. (MS)
111 East Carolina (NC)
112 South Carolina St.
113 San Jose St. (CA)
114 Sewanee (TN)
115 Wyoming
116 Colorado St.
117 Dayton (OH)
118 Fresno St. (CA)
119 Idaho
120 Drake (IA)
121 North Texas
122 Virginia Military Institute
123 Montana
124 Utah St.
125 Alcorn St. (MS)