AARoads:United States/Colorado/All-time list

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Given are the years of the first and last official maps the routes appear on (latest I have is 2006). These are not always the exact years the routes were created or eliminated.

Note: Highways 200-233 page on mesalek.com is missing.

Probably missing routes
  • The first number to be reused was 107 in 1932 (first one disappeared 1926); 128 (disappeared 1930) waited until 1936.
  • Just before 1939, all numbers from 50 to 189 have been found except:
    • 85 (renumbered 189 because it touched US 85)
    • 182, 184, 188 (even numbers ended with 180, except that 186 was assigned at the same time as 185)
    • 178 (unlabeled, but location suggested below)
    • Additionally, I haven't found a pre-1939 18, even though 20 and 22 existed.
  • After the large expansion in 1939, all numbers from 1 to 378 have been found. The following are unlabeled:
    • 178 (can't find it anywhere on any map; location suggested below)
    • 230 (doesn't appear until 1940; location suggested below)
    • 266 (doesn't appear until 1940; location suggested below)
    • 271 (doesn't appear until 1945; location suggested below)
    • 319 (doesn't appear until 1942; location suggested below)
    • 336 (doesn't appear until 1942; location suggested below)
  • Why were some numbers (200, 218, 266, 355) reused in 1949-1951 and others were not? (243, 250, 261); 243's location is suggested below
  • After the large cutback in 1953, all numbers from 1 to 30 were used except:
    • 11 (doesn't appear until 1959)
    • 18 (doesn't appear until 1958)
    • 20 (doesn't appear until 1956, but was likely proposed 1952)
    • 29 (doesn't appear until 1964)
  • Finally, in 1968, everything from 1 to 33 except 21 was used, as were even numbers up to 42 except 34.
Out-of-place routes

The following don't quite fit into the 1938 clustering:

  • 225: near 207-215
  • 237: near 369-377
  • 243-245: near 221-223; but also near 246
  • 299: near 265-269
  • 305: near 241-247
  • 309: near 241-247
  • 331: near 355-361
  • 182-184: probably added before 1938
  • 240: near 254-256
  • 246: near 220-224; but also near 243-245
  • 284: near 364-366
  • 308: near 312-314
  • 328: near 306; but also near 327
  • 334: near 286
  • 344: near 220-224
from to notes
SH 1 1923 now
SH 2 1923 now
SH 3 1982
← 160/550 (part)
now
SH 3 1923 1968
SH 4 1923 1968
SH 5 1955 now had been part of 103 until 1953
SH 5 1954 1954
SH 5 1939 1952
SH 5 1923 1937
SH 6 1923 1968
SH 7 1923 now
SH 8 1923 now
SH 9 1923 now
SH 10 1923 now
SH 11 1971 now had been part of 51 until 1953
SH 11 1959 1968
SH 11 1923 1952
SH 12 1923 now
SH 13 1923 now
SH 14 1923 now
SH 15 1923 now
SH 16 1971 now
SH 16 1923 1968
SH 17 1923 now
SH 18 1973 1999? last seen on on 1997 map; not on 1999 map, but still shown on CDOT 2000 traffic database, so was removed some time in 1999; signage was not removed until summer 2001
SH 18 1958 1968
SH 18 1939 1952
SH 18 1934 1937 Park Avenue, Denver?
SH 19 1923 1968
SH 20 1956? 1968 unlabeled at first; was likely proposed in 1952, the same day or shortly after the SH 20 listed below was cancelled
SH 20 1934 1951
→ 182 (part)
missing from 1936 county map
SH 21 2007 now
SH 21 1955 1963
→ 71 (part)
SH 21 1954 1954
SH 21 1939 1952
SH 21 1934 1937
SH 22 1954 now
SH 22 1936 1952 missing from 1936 county map; why did it have an even number?
SH 23 1989
← 176
now
SH 23 1954 1988
SH 23 1939 1952
SH 24 1954 1968
→ 44
SH 24 1939 1952
SH 25 1939 1968
→ 55
SH 26 1966 now had been part of 74 until 1953
SH 26 1954 1964
SH 26 1940 1952
→ 243? (part)
unlabeled until 1942
SH 26 1939 1939
→ 88 (part)
245 to 243
SH 27 1957
← 1 (part)
1968
SH 27 1954
← 153 (part)
1956
SH 27 1939 1952
SH 28 1954 1988
SH 28 1939 1952
SH 29 1964 2007 signage removed spring 2008
SH 29 1939 1952
SH 30 1955 now
SH 30 1954 1954
SH 30 1939 1952
SH 31 1962 1969
→ 470
SH 31 1939 1952
SH 32 1968
← 72 (part)
2004 not on CDOT 2000 traffic database
SH 32 1959 1961 part had been 146 until 1953
SH 32 1939 1952
SH 33 1969
← 36
2002 on 1999 map (but not on next map, which is 2002); removed on January 18, 2002
SH 33 1966 1968
SH 33 1939 1952
SH 34 1939 1952
SH 35 1972 now
SH 35 1939 1952
SH 36 1969 now
SH 36 1960 1968
→ 33
unlabeled at first; parts had been 178 and 384 until 1953
SH 36 1939 1952
SH 37 1939 2007
SH 38 1962 2007 signage removed spring 2008
SH 38 1939 1952
SH 39 1939 now
SH 40 1969 now
SH 40 1962 1968
SH 40 1939 1952
SH 41 1966 now
SH 41 1939 1952
SH 42 1961 now not labeled until 1965; had been 168 until 1953
SH 42 1939 1952
SH 43 1939 1952
SH 44 1969
← 24
now
SH 44 1939 1952
SH 45 1966 now
SH 45 1939 1952
SH 46 1973 now part of 58 until 1953; extended east in 1984
SH 46 1939 1954
SH 47 1970 now
SH 47 1939 1952
SH 48 1939 1952
SH 49 1968 1968
SH 49 1939 1952
SH 50 1923 1968
→ 105 (part)
disappeared after 1952 but came back in 1955, with the east end at Vollmer Road
SH 51 1969
← 70
1998 renumbered between March and July 1998; not on the 1998 map
SH 51 1923 1968
SH 52 1923 now
SH 53 1972 now
SH 53 1923 1952
SH 54 1923 1968
SH 55 1969
← 25
now
SH 55 1914 1952
SH 56 1923 now
SH 57 1923 now
SH 58 1914 now
SH 59 1923 now
SH 60 1923 now
SH 61 1923 now
SH 62 1923 now
SH 63 1923 now
SH 64 1923 now
SH 65 1916 now
SH 66 1923 now
SH 67 1923 now
SH 68 1968 2005
SH 68 1923 1952
SH 69 1916 now
SH 70 1923 1968
→ 51
SH 71 1923 now
SH 72 1916 now
SH 73 1919 1965
SH 74 1923 now
SH 75 1919? now
SH 76 1923 1976
→ 78
SH 77 1923 1954
SH 78 1977
← 76
now
SH 78 1923 1968
SH 79 1923 now
SH 80 1923 1968
→ 141 (part)
SH 81 1939 1952
SH 81 1923 1937
→ 2 (part)
SH 82 1923 now
SH 83 1923 now
SH 84 1923 1968
→ 134
SH 85 1939 1952
SH 85 1919 1935
→ 189
Renumbered because it intersected US 85.
SH 86 1923 now
SH 87 1919? 1968
→ 75 (part)
SH 88 1919 now
SH 89 1923 now
SH 90 1923 now
SH 91 1921 now
SH 92 1923 now
SH 93 1922? now
SH 94 1923 now
SH 95 1922 now
SH 96 1923 now
SH 97 1922 now
SH 98 1922 1952
→ 74 (part)
SH 99 1922 1954
→ 142 (part)
section south of 142 gone after 1952
SH 100 1922 now only a spur from 1964 survived past 1968; why was this spur not numbered 197 (as it was until the 1953 cutback)?
SH 101 1922 now
SH 102 1922 1968
SH 103 1922 now
SH 104 1922 1952
SH 105 1923 now
SH 106 1923 1968
SH 107 1932 1952
SH 107 1922 1924
→ 2 (part)
Wiggins northwest
SH 108 1923 1952
→ 145 (part)
SH 109 1923 now
SH 110 1923 now
SH 111 1923 1967
SH 112 1923 now
SH 113 1923 now
SH 114 1923 now
SH 115 1923 now
SH 116 1923 now
SH 117 1923 1952
SH 118 1923 1952
→ 116 (part)
SH 119 1923 now
SH 120 1923 now swapped with 50 in 1949-1951
SH 121 1923 now
SH 122 1923 1997 last shown in 1992; no city insets in 1993; next map is 1997 (was likely deleted right before that map was created); signage was still there in July 1998
SH 123 1923 1968
SH 124 1923 1952
SH 125 1923 now
SH 126 1923 1952
SH 127 1923 now
SH 128 1936 now unlabeled until 1939
SH 128 1924 1929
→ 4 (part)
west from Lake George
SH 129 1923 1954
SH 130 1924 1952
SH 131 1923 now
SH 132 1924 1975
SH 133 1923 now
SH 134 1969
← 84
now
SH 134 1924 1952
SH 135 1923 now
SH 136 1924
← 15 (part)
now
SH 137 1923 1952
SH 138 1924 1952
SH 139 1923 now
SH 140 1926 now
SH 141 1923 now
SH 142 1926 now
SH 143 1923 1952
SH 144 1926
← 2 (part)
now unlabeled until 1927
SH 145 1923 now
SH 146 1968 1985
→ 141 (part)
had been 403 until 1953
SH 146 1939 1952 became part of 32 in 1958-1959
SH 146 1927 1937 missing from 1936 county map (it looks like the park boundaries had been extended to include it)
SH 147 1923 1977
→ 184 (part)
SH 148 1927 1952 missing in 1929
SH 149 1923 now
SH 150 1929 now disappeared after 1952 and reappeared in 1960
SH 151 1923 now
SH 152 1929 1981
SH 153 1923 1968
→ 2 (part)
SH 154 1929 1952
SH 155 1923 1952
SH 156 1939 1952
SH 156 1929 1937 became part of 150 in 1973-1974
SH 157 1974 now
SH 157 1923 1954
SH 158 1930 1952
SH 159 1923 now
SH 160 1930 1968
→ 72 (part)
SH 161 1936 1952
SH 161 1923 1935
SH 162 1930 1983
SH 163 1923 1968
SH 164 1936 1952
SH 164 1930 1934
→ 133 (part)
became 327 in 1939
SH 165 1923 now
SH 166 1934 1952 probably became part of 51 in 1958-1959
SH 167 1923 now
SH 168 1934 1952 may have been restored as a short connector west to Louisville in 1961; became part of 42 in 1965
SH 169 1923 1968 swapped with 59 in 1932-1934
SH 170 1939 now
SH 170 1934 1937
→ 7 (part)
SH 171 1939 1952
SH 171 1926 1937
SH 172 1934 now
SH 173 1939 1952
SH 173 1927? 1937
→ 93 (part)
shown on 1936 county map to use Illinois north of 19th (68), and then topos imply that it used 14th-Washington to 10th (58) - but did it share a beginning with 93, or did 93 continue on 19th (with 68) and Ford?
SH 174 1939 1952
SH 174 1934 1937?
→ 153 (part)
doesn't show up on state maps; Quincy Avenue from 1 to 177, Littleton
SH 175 1939 1952
SH 175 1927 1937
93 (part)
SH 176 1936 1988
→ 23
disappeared after 1952; restored in 1968; there may have been an earlier 176 in Metro Denver
SH 177 1929 now
SH 178 1942 1952
→ 72 (part)
185 (now I-25) to 2
SH 178 1936 1940 64th Street, northeast Denver from 2 to 3; unlabeled
SH 179 1930 1952
SH 180 1936 1961 1939 map contradicts itself on whether the 1937 route was part of 72 or still 180 in 1939
SH 181 1930 1952
SH 182 1939 1968
SH 183 1934 now
SH 184 1939 now
SH 185 1934 1968
SH 186 1934 1952 why was this created in 1934 when 174-184 didn't exist yet?
SH 187 1935 2010
SH 188 1939 1952
SH 189 1936
← 85
1952
SH 190 1939 1952
SH 191 1939 1952
SH 192 1939 1968
SH 193 1939 1952
SH 194 1939 now
SH 195 1939 1952
SH 196 1939 now
SH 197 1939 1952
SH 198 1939 1952
SH 199 1939 1952
SH 200 1951 1967 US 287 at The Forks to west of Livermore
SH 200 1939 1949 US 287 north of Wiley to Big Bend
SH 201 1939 1952 southwest from SH 101 south of Las Animas
SH 202 1939 now
SH 203 1939 1952 north from US 50 north of Las Animas
SH 204 1939 1952 US 85-87 east to SH 239 (this section now a county road) via Hoehne
SH 205 1939 1952 US 50 at Swink south to SH 10
SH 206 1939 1952 US 160-350 southwest of Beshoar Junction east to SH 55 (now a county road)
SH 207 1939 now
SH 208 1939 1952 Loop off US 24 from Calhan north then east to Ramah
SH 209 1939 now Section northeast of Beone eliminated 1953
SH 210 1939 1952 SH 83 east to SH 189 at Black Forest via Shoup Road
SH 211 1939 1952 south from SH 94 at Hall Station
SH 212 1939 1952 US 85 at Castle Rock southeast to SH 83
SH 213 1939 1952 southeast from SH 94 at Yoder via Truckton
SH 214 1939 1952 SH 105 west of Castle Rock east via Wolfensberger Road to Castle Rock, then northeast via Crowfoot Valley Road to SH 83 south of Parker
SH 215 1939 1952 SH 94 at Ellicott north to US 24
SH 216 1939 1952 US 85-87 (now Spruce Mountain Rd.) south of Larkspur east via Greenland to SH 83
SH 217 1939 1964 SH 157 at Elbert to US 24 in Peyton; disappeared after 1952 but came back in 1955 from US 24 north to the Elbert-El Paso County line
SH 218 1951 1952 northwest from SH 91 at Climax (might be being added to mesalek.com)
SH 218 1939 1949 SH 105 east to US 85-87 at Larkspur
SH 219 1939 1952 south from SH 86 at Elizabeth
SH 220 1939 1952 US 6 in Commerce City (near Denver) east via 60th to Tower or Chambers
SH 221 1939 1952 Kassler northeast to US 85 at Blakeland
SH 222 1939 1952 SH 93 north of Golden east via 64th Ave. to SH 72
SH 223 1939 1952 Belleview Ave. north to Hampden Ave. via Yosemite St. in Denver
SH 224 1939 now originally Sheridan Blvd. to York Street and south to Brighton Blvd; in 1946 west of SH 185 was turned back; in 1953 east end shortened to York Street; restored west to the Valley Highway Freeway in 1956; restored west to Broadway in 1963, and extended north to US 36; extended east to I-80S by 1964, and east to US 6-85 by 1970.
SH 225 1939 1952 SH 109 (now a county road) at Karval due north to SH 94
SH 226 1939 1952 US 85 in Colorado Springs along Cheyenne Blvd. to Broadmoor
SH 227 1939 now Sections from BR US 50 south along South Road, 27th Lane, CR 321, and north from SH 96 via Hudson Road eliminated by 1954;
SH 228 1939 1954 SH 227-235 intersection southeast of Pueblo at Lombard Village (25th Lane and South Rd.) east via South Road, County Road 323, and Olson Road, and Asbury Lane to BR US 50 (then US 50) halfway between Avondale and Boone; east end shortened to 42nd Lane and west end truncated to old SH 227 (27th Lane) and extended south over old SH 227 2 miles in 1953
SH 229 1939 1952 SH 96 at North Avondale south via Avondale to SH 228; now Avondale Boulevard
SH 230 1940 1952 SH 164 (now a county road) north of US 24 east to US 85-87 at Colorado Springs
SH 230 1939 1939
→ 69 (part)
southwest from Walsenburg; change was made right before the map was made
SH 231 1939 now Originally ended at SH 228 (now South Road); south of BR US 50 eliminated in 1968
SH 232 1939 1952 southwest from US 85-87 at Aguilar to Gulnare, with a spur northwest to Broadhead
SH 233 1939 2017
SH 234 1939 1952
SH 235 1939 1952
SH 236 1939 1952
SH 237 1939 1952
SH 238 1939 1952
SH 239 1939 now
SH 240 1939 1954
SH 241 1939 1952
SH 242 1939 1981
SH 243 1951 1968 Fox Street and Broadway from SH 26 to SH 382; was this related to the previous one?
SH 243 1939 1949
→ 185 (part)
SH 244 1939 1952
SH 245 1939 1961
SH 246 1941 1952
→ 1 (part)?
SH 246 1939 1939
→ 87 (part)
SH 247 1939 1952
SH 248 1939 1981 disappeared after 1952 but came back in 1955
SH 249 1939 1952
SH 250 1939 1947
SH 251 1939 1952
SH 252 1939 1952 first appears on 1940 map, but almost certainly existed in 1939
SH 253 1939 1952
SH 254 1939 1962
SH 255 1939 1952
SH 256 1939 2007
SH 257 1939 now
SH 258 1939 1952
SH 259 1939 1952
→ 257 (part)
SH 260 1939 1952
SH 261 1939 1949
SH 262 1939 1963
→ 66 (part)
SH 263 1939 now unlabeled in 1939
SH 264 1939 1952
SH 265 1942 now
SH 265 1939 1941
SH 266 1951 now
SH 266 1940 1949
SH 266 1939 1939 → 277 (part) 143 southwest to 96 at Silver Cliff; change was made right before the map was made
SH 267 1939 1952
SH 268 1939 1952
SH 269 1939 1952
SH 270 1939 1952
SH 271 1943 1952
SH 271 1940 1941 US 50/SH 6 to SH 9
SH 271 1939 1939 West from Manitou Springs via Ruxton Avenue; unlabeled in 1939, but was almost certainly numbered 271
SH 272 1939 1952
SH 273 1939 1952
SH 274 1939 1952
SH 275 1939 1952 first appears on 1940 map, but almost certainly existed in 1939
SH 276 1939 1952
SH 277 1939 1952
SH 278 1939 1984
SH 279 1939 1999 not in the CDOT 2000 traffic database
SH 280 1939 1952
SH 281 1939 1952
SH 282 1939 1952
SH 283 1939 1952
SH 284 1939 1952
SH 285 1939 1952
SH 286 1939 1952
SH 287 1939 1952
SH 288 1939 1952
SH 289 1939 1952
SH 290 1939 1952
SH 291 1939 now swapped with 15 in 1941-1942
SH 292 1939 1952
SH 293 1939 1952 swapped with 78 in 1939-1940
SH 294 1939 1952
SH 295 1939 1952
SH 296 1939 1952
SH 297 1939 1952
SH 298 1939 1952
SH 299 1939 1952
SH 300 1939 now
SH 301 1939 1952
SH 302 1939 1952
SH 303 1939 1952
SH 304 1939 1952
SH 305 1939 1952
SH 306 1939 1983
SH 307 1939 1952
SH 308 1939 1952
SH 309 1939 1952
SH 310 1939 1952
SH 311 1939 1952
SH 312 1939 1952
SH 313 1939 1952
SH 314 1939 1952
SH 315 1939 1952
SH 316 1939 1952
SH 317 1939 now
SH 318 1939 now
SH 319 1942 1952? inset style changes in 1947; 319 is still shown but unlabeled
SH 319 1940 1941 SH 132 (now CR 8) east of Buford southeast via CR 155 to Trappers Lake
SH 319 1939 1939 → 321 (part) south from SH 64 (this section now CR 4) south of Meeker
SH 320 1939 1952
SH 321 1939 1952
SH 322 1939 1952
SH 323 1939 1952
SH 324 1939 1952
SH 325 1939 now
SH 326 1939 1952
SH 327 1939 1952
SH 328 1939 1952
SH 329 1939 1952
SH 330 1939 now
SH 331 1939 1952
SH 332 1939 1952
SH 333 1939 1952
SH 334 1939 1952
SH 335 1939 1952
SH 336 1942 1954
SH 336 1939 1941 US 50/SH 6 in Whitewater east to SH 65
SH 337 1939 1952
SH 338 1939 1952
SH 339 1939 1952
SH 340 1939 now
SH 341 1939 1952
SH 342 1951 1952 close to the first one
SH 342 1939 1947
SH 343 1939 1952
SH 344 1939 1952?
SH 345 1939 1952
SH 346 1939 1952
SH 347 1939 now
SH 348 1939 now
SH 349 1939 1952
SH 350 1939 1952
SH 351 1939 1952
SH 352 1939 1952
SH 353 1939 1952
SH 354 1939 1952
SH 355 1951 1967
SH 355 1939 1949
SH 356 1939 1952
SH 357 1939 1952
SH 358 1939 1952
SH 359 1939 1952
SH 360 1939 1952
SH 361 1939 1984
SH 362 1939 1952
SH 363 1939 1952
SH 364 1939 1952
SH 365 1939 1952
SH 366 1939 1952
SH 367 1939 1952
SH 368 1939 now
SH 369 1939 1952
SH 370 1939 now
SH 371 1939 now
SH 372 1939 1952
SH 373 1939 1952
SH 374 1939 1988
SH 375 1939 1952
SH 376 1939 1952
SH 377 1939 1952
SH 378 1939 1952
SH 379 1942 1952
SH 380 1942? 1952??
→ 72 (part)
unlabeled; confirmed on 46th Avenue by 1947 Gousha; may have become part of 72 by 1946, but 1954 is the first one to clearly show 72 on 46th and nothing on 40th
SH 381 1946 1952
SH 382 1942 1967
→ 49 (part)
SH 383 1946 1952
SH 384 1946 1952 became part of 36 in 1959-1960
SH 385 1947 1952
SH 386 1947 1952
SH 387 1949 1952
SH 387 1947 1947
→ 388
SH 388 1949
← 387
1952
SH 389 1949 now
SH 390 1949 1952
SH 391 1951 now unlabeled at first
SH 392 1949 now
SH 393 1951 1952
SH 394 1949 now
SH 395 1951 1952
SH 396 1951 1952
SH 397 1951 1952
SH 398 1951 1977
→ 170 (part)
SH 399 1951 1952
SH 400 1951 1957
SH 401 1951 1952
SH 402 1951 now
SH 403 1951 1952 became 146 in 1968
SH 404 1951 1952 west from Egnar
SH 470 1970
← 31
now
SH 789 1955 1983