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Location: Eastern Mountains
Length: 25mi
S End: Jct SH 119 at Nederland
N End: Jct SH 7 near Raymond
Places: Nederland, Ward, Raymond (current SH 72)
History:
SH 160 is the original 1920s number for current
SH 72 from SH 119 at Nederland north to SH 7 at Raymond. By
1961 the only section not paved was around Ward, and that
was paved by 1965. Renumbered as an extension of SH 72 in
the purge of 1968 to avoid duplication with US 160. One of
the few 1920s state highway numbers to violate the odd
north-south, even east-west rule.
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Location: Southern Western Slope > Southern
Mountains > San Luis Valley > Southern Front Range
> Arkansas Valley
Length*: 497.22mi
W End: New
Mexico border just east of the Four Corners (link to
Steve Riner's site)
E End: Kansas
border east of Walsh (link to Richie Kennedy's site)
Nationally: W End: US 89 near Tuba City, Arizona; E
End: US 67 near Poplar Bluff, Missouri (1444mi)
Counties: Montezuma, La Plata, Archuleta, Mineral,
Rio Grande, Alamosa, Costilla, Huerfano, Las Animas,
Baca
Places: Four Corners, Cortez, Mancos, Durango,
Bayfield, Pogosa Springs, Wolf Creek Pass, South Fork, Del Norte, Monte
Vista, Alamosa, Blanca, Fort Garland, North La Veta Pass,
Walsenburg, Trinidad, Kim, Pritchett, Springfield, Vilas,
Walsh
See the separate US 160 page for the remainder of the information.
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Location: Southern Mountains
History:
Looks to be a road that never got passed the
projected/impassable stage. First shown with a dashed line
from SH 149 at Gateview northwest to US 50 west of Sapinero
on the 1939 map. Gone by 1954.
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Location: Central Mountains
Places: Parlin, Pitkin, Mount Princeton Hot Springs,
Nathrop
History:
SH 162 is an original 1920s highway, and went
from US 50 at Parlin northeast to Waunita Hot Springs, then
back southeast to US 50. By 1936 it went northeast from
Parlin via Ohio ending at Pitkin. In 1939 a second section
of it was added, from US 285 at Nathrop southwest to Mount
Princeton Hot Springs.
By 1954 the western section of SH 162 had been
turned back, so it went only from US 285 west for the
*4.40mi to Mount Princeton Hot Springs. Paved by 1960.
Turned back by 1984. Now CR 162.
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Location: San Luis Valley
Length: 6mi
S End: New Mexico border south of Antonito
N End: Jct SH 17 at Antonito
History:
SH 163 is the original state number for current
US 285 from Jct SH 17 at Antonito south to New Mexico. It
became part of US 285 about 1942, and from then on it served
only as US 285's carrier route. Paved by 1946.
Decommissioned, along with the other carrier routes, in the
purge of 1968.
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Location: South Front Range
Length: ~10mi
S End: Jct US 24 east of Manitou Springs
N End: Jct US 85-87 north of Pikeview
History:
Brought into the state system by 1937, and went from US
24 east of Manitou Springs northeast to US 85-87 north of
Pikeview. Paved by 1946 and turned back by 1954.
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Location: Four Corners
Length: 39mi
SW End: New
Mexico border just east of the Four Corners (link to
Steve Riner's site)
NE End: Jct US 160 in Cortez
Nationally: SW End: Tuba City, Arizona (274mi)
History:
This has got to be one of the strangest modern-day US
Highways. US 164 had a very short life along what is
now US 160 from US 89 at Tuba City, Arizona to US 666
south of Cortez, then co-marked with US 666 north into Cortez, ending at US 160. The roadway that is now US 160 past the
Four Corners did not become a state-maintained highway until
about 1963, and it was at first designated AZ 64 and
SH 40. US 164 was
then run over that alignment about 1966. It was in violation
of the numbering system, considering it doesn't touch US 64.
The most likely source of the 164 number is from AZ
64.
US 164 was decommissioned at the end of 1970. US
160 previously went from Cortez northwest via US 666 (current US 491),
while US 666's north end was Cortez. I would assume
that the decommissioning of US 164, the realignment
of US 160, and the extension northward of US 666 were
all done at the same time.
The Four Corners area is probably the area of the country
that has undergone the most changes in its US Highways over
the years. 84, 160, 163, 164, 191, 450, 491, 550, 560 and
666 have all changed at one time or another.
Related Site: Historic US Highway Endpoints in Cortez from Dale Sanderson
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Location: South Front Range
Length*: 36.89mi
NW End: Jct SH 96 at McKenzie Junction
SE End: I-25 Exit 74 east frontage road northeast of Colorado City
Counties: Custer, Pueblo
Places: McKenzie Junction, San Isabel, Rye, Colorado
City
 Scenic & Historic Byways: Frontier Pathways 
Milepost Guide:
- 0.00: SH 96 (begin SH 165 in Custer County)
- 15.31: SH 78
- 18.76: Enter Pueblo County
- 36.84: I-25 Exit 74 interchange
- 36.89: I-25 east frontage road (end SH 165)
Annual Average Daily Traffic (2008):
- 220 at SH 96
- 300 southeast of SH 78
- 870 southeast of CR 371, San Isabel
- 2400 at Main St., Rye
- 5200 at I-25, Colorado City
Guide:
After starting at SH 96, SH 165 heads southeast via a
very twisty route, through San Isabel, then through the
suburban development that is Colorado City, then northeast
to I-25.
History:
SH 165 is an original 1920s highway, at first going from
SH 76 (current SH 78) southeast to US 85 at Crow. By
1938 it was paved from Rye to Crow. By 1954 a lot of SH 165
had been turned back, so that it went from US 85 to Rye
only. By 1955 it was extended from Rye northwest for 19mi,
and by 1957 was extended back to SH 96. All sections paved
by 1964.
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Location: North Eastern Plains
Length: 4mi
SE End: Jct US 138 west of Julesburg
NW End: Nebraska border northwest of Julesburg
History:
SH 166 is the original state number for current
US 385 from US 138 northwest to Nebraska. It became a state
highway about 1938, but then was turned back by 1954. The
alignment became a state highway again when it became US 385
about 1959.
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Location: Arkansas Valley
Length*: 4.86mi
N End: Jct SH 96 north of Fowler
S End: Becomes Otero CR 2 at Jct CR JJ south of
Fowler
Counties: Crowley, Otero
Places: Fowler
Milepost Guide:
- 0.00: SH 96 (begin SH 167 in Crowley County)
- 0.96: Enter Otero County
- 1.67: US 50, Fowler
- 4.86: CR JJ (end SH 167)
Annual Average Daily Traffic (2008):
- 750 at SH 96
- 1300 south of US 50, Fowler
- 190 at CR JJ
Guide:
From SH 96, SH 167 heads due south across the Arkansas
River to Fowler, and south through it on Main St. It
crosses US 50 at Cranston Ave., and on the south side of
town, SH 167 turns west on Grant Ave., then west of town
at CR 2 turns south. The south end of SH 167 is at CR JJ where it becomes CR 2.
A couple miles futher south on CR 2 is the private Fowler Air
Field, which may or may not be the reason SH 167 extends south of
Fowler the way it does. If SH 167 were meant to serve the airport it
ends too short.
Photo Gallery:
History:
SH 167 is an original 1920s highway, but it didn't used
to go south of US 50. It was extended south to its current
end by 1939. Paved from SH 96 to US 50 by 1946, and entirely
by 1954.
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Location: North Metro Denver
Length: 5mi
NW End: Jct SH 7 west of Lafayette
SE End: Jct US 287 south of Lafayette
Places: Louisville
History:
SH 168 was the first state highway number for
current SH 42 through
Louisville, becoming a state highway about 1937. SH
168 was turned back by 1954, but was then brought back
as SH 42 about 1961. Interesting that they didn't recycle
the 168 number when it was brought back.
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Location: Arkansas Valley
History:
SH 169 has had a very varied life. Starting out
from the 1920s it went from SH 59 at Wiley south to
US 50. By 1936 it was rerouted and went from Wiley east and
south to the US 50 curve north of Lamar. By 1939 it was
extended from that point east to Bristol then east and south
to US 50. By 1954 all that was out the window, and SH
169 went only from SH 196 north 5mi to May Valley. Paved
by 1960. Turned back by 1970.
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Location: Northwest Metro Denver
Length*: 6.97mi
W End: Eldorado Springs
E End: Jct US 36 at McCaslin Blvd. north of central
Superior
Counties: Boulder
Places: Eldorado Springs, Marshall, Superior
Roadway Names: Marshall Road
Milepost Guide:
- 0.00: Eldorado Springs (begin SH
170 in Boulder County)
- 2.46: SH 93, Marshall
- 6.97: US 36 interchange (end SH 170)
Annual Average Daily Traffic (2008):
- 1400 at Eldorado Springs
- 4500 east of SH 93, Marshall
- 19,400 west of McCaslin Blvd.
- 31,800 at US 36, Superior
Guide:
Eldorado Springs is up a valley in the foothills a ways,
and from there SH 170 heads east, crossing over SH 93 at
Marshall. Then, it goes east to US 36, but doesn't end at it
right away, instead paralleling its south side southeast to
the McCaslin Blvd. exit on US 36, ending there.
History:
SH 170 is an original 1920s state highway, and at first had
SH 7's current routing from US 85 at Brighton east to US 6.
By 1939 it was moved and went from US 87 (current US
287) west via Dillon Road and Superior Marshall, then north
to Boulder. By 1947 it was paved from Marshall to Boulder.
By 1954 SH 170 went from US 287 west to Marshall, since
the highway north of Marshall had been renumbered as part of
SH 93. Paved from US 287 to Marshall by 1960. Section east
of the Denver-Boulder Turnpike turned back about 1965. The
section from SH 93 west to Eldorado Springs was numbered
SH 398 and brought onto the state payroll in 1950.
SH 398 was decommissioned and SH 170 extended over it
to Eldorado Springs about 1977.
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Location: South Front Range
Length: ~1mi
S End: Jct US 85-87 at Aguilar
N End: Jct US 85-87 at Aguilar
History:
This SH 171 appears to be an original 1920s
highway, which formed a loop off the west side of US 85-87
at Aguilar. Paved by 1938 and turned back to next year.
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Location: Eastern Plains
Alignment: Spur south from US 24 at Matheson
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Location: South Western Slope
Length*: 24.49mi
S End: New Mexico border north of the Navajo Dam,
connecting with NM 511 (link to Steve Riner's site)
N End: Jct US 160 southeast of Durango
Counties: La Plata
Places: Ignacio, Oxford
Scenic & Historic Byways:
- Tracks Across Borders (SH 151 to US 160)
Milepost Guide:
- 0.00: New Mexico border (begin SH 172 in La Plata County)
- 8.90: SH 151/Ute St., Ignacio
- 24.49: US 160 (end SH 172)
Annual Average Daily Traffic (2008):
- 460 at New Mexico border
- 1600 north of CR 322
- 8600 north of SH 151, Ignacio
- 5100 north of CR 516
- 5700 north of CR 309
- 9200 at US 160
Guide:
From the New Mexico border, SH 172 follows the Los Pinos
River north to Ignacio, where it goes north through town on
Goddard Ave. North of Ignacio, SH 172 turns west, goes
through Oxford, then goes north, west, and north, ending at
US 160.
History:
SH 172 dates from the mid-1930s, and went from US 160
southeast to Ignacio as now, but then went southeast via
current SH 151 to Arboles. SH 151 used to go south from
Arboles to New Mexico. SH 172 was paved southeast to Ignacio
by 154, and entirely paved by 1960. SH 172 was rerouted so
that it went from Ignacio south to New Mexico by 1972.
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Location: Golden/West Metro Denver
History:
On mid-1930s state maps, SH 173 is shown only as the
number "173" next to the dot for Golden. That probably means
it was a highway entirely within Golden, but maybe not.
However, by 1939 the alignment of SH 173 is shown
more clearly as going from Colfax Avenue north to Ralston
Road. The street it used is unknown, but might have been
Ward Road and Youngfield Street.
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Location: San Luis Valley
Alignment: Short loop off the south side of SH 17
west of Antonito, through Canon
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Location: Northwest Metro Denver
Length: ~15mi
S End: Jct SH 58 northwest of Golden
N End: Eldorado Springs
History:
This SH 175 appears to be an original 1920s route
that went from Golden north to Eldorado Springs (NOT
current SH 93, it was west of that). Gone by 1939.
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Location: San Luis Valley
Alignment: Loop off the west side of SH 163
(current US 285) south of Antonito
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Location: North Eastern Plains
Length*: 17.76mi
SW End: Jct US 385 on the north side of Holyoke
NE End: Nebraska border at Venango, connecting with
NE 23
Places: Holyoke, Amherst, Venango (current SH 23)
History:
SH 176 dates from the mid-1930s and had current
SH 23's route from US 385 north of Holyoke northeast via
Amherst to Nebraska. However, by 1954 it was turned back,
but then was resurrected by 1968. SH 176 was
renumbered as SH 23 about 1989. Old SH 23 on the
Western Slope was turned back at the same time, so it looks
like the moment the 23 number became available, CDOT changed
176 to 23 to match the Nebraska numbering. According
to George Sammeth who spoke to a guy at CDOT about this, the
176 to 23 switch was made in order to avoid
confusion, as both SH 176 and I-76 were in the same
part of the state.
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Location: Southeast Metro Denver
Length*: 6.11mi
S End: Jct SH 470 at Highlands Ranch
N End: Jct US 285 at Hampden Ave./University Blvd. in
Cherry Hills Village
Counties: Douglas, Arapahoe
Places: Highlands Ranch, Centennial, Greenwood
Village, Cherry Hills Village
NHS: Entire length.
Roadway Names: University Boulevard
Milepost Guide:
- 0.00: SH 470 interchange (begin SH 177 in Douglas County)
- 0.13: Enter Arapahoe County
- 4.11: SH 88/Belleview Ave.
- 5.99: US 285/Hampden Ave. (end SH 177)
Annual Average Daily Traffic (2008):
- 35,300 at SH 470
- 27,200 north of County Line Rd
- 33,600 north of SH 88/Belleview Ave.
- 30,200 at US 285/Hampden Ave.
Guide:
University Blvd. is one of the arterial grid streets in
the southeast metro. From a diamond interchange at SH 470 on
the north side of the mega housing development Highlands
Ranch (not an incorporated city), SH 177 heads due north
through the new-as-of-September-2000 city of Centennial,
through Greenwood Village, and Cherry Hills Village, ending
at US 285.
History:
SH 177 dates from the 1920s, and from from US 85
southeast of Sedalia north (probably via Daniels Park Road)
to University Blvd., then that north to Colfax Avenue. By
1936 it had been extended north via York Street to Brighton
Blvd. By 1946 the north end was trimmed back to 46th Avenue
(US 6-85).
By 1954 SH 177's north end was at Colfax Avenue and south
end was County Line Road. By 1960 the north end was trimmed
back to the Valley Highway (US 87/SH 185). The north
end was then trimmed back again, this time to Hampden
Avenue, by 1963. It was extended south to the SH 470 freeway
when that was completed through there in 1986.
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Never found an SH 178 on any of the maps researched with.
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Location: Northern Mountains
Length: 17mi
S End: Jct SH 131 at Haybro
N End: Jct US 40 at Milner
History:
SH 179 was a link from US 40 at Milner south to
SH 131 at Haybro. Before 1939 it was shown as
projected/impassable on maps. Turned back by 1954.
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