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Interstate Business Route 25

Interstate 25 has 15 active business routes and four former routes along its 1,063 mile course.

Truth or Consequences
Business Loop I-25 winds 5.7 miles east through the city of Truth or Consequences between Exits 75 and 79. Broadway Street (old U.S. 85) leads the route northeast to Downtown, where it splits into a one-way couplet with Main Avenue westbound. Date Street continues the route north back to I-25. The business loop is well-signed and links to New Mexico 51 (Third Avenue).
This 3.3 mile long business route in Socorro overtakes old U.S. 85 along California Street from a trumpet interchange (Exit 147) and access road leading north from I-25. U.S. 60 accompanies Business Loop I-25 (California Street) between Spring Street and the north end at Exit 150.
Interstate 25 bypasses the city of Belen to the west as the business route lines old U.S. 85 north along Main Street from Exit 190. New Mexico 314 used to run concurrent with the route, but now begins at the north Belen interchange between Main Street and the Business Loop I-25 expressway leading west to Exit 195.
Santa Fe
Maps of Santa Fe from the 1980s and 1990s indicated a Business Loop I-25 through Santa Fe via Cerrillos Road (old U.S. 85), St. Michaels Drive (old U.S. 85 Bypass) and Old Pecos Trail (old U.S. 84 & 285). However, as investigated in 2008, the routing was signed as parts of New Mexico 14 and New Mexico 466.
Las Vegas
Business Loop I-25 in Las Vegas follows old U.S. 85 via Grand Avenue between Exits 343 and 347. Trailblazers line the route for New Mexico 518, which begins at the intersection of Grand Avenue and Seventh Street Downtown. NM 518 follows Seventh Street northwest to Taos via Mora.
This business loop follows Maxwell Avenue and Railroad Avenue along historic U.S. 85 between Exits 412 and 414. It provides the connection from Interstate 25 to U.S. 56 & 412 east and New Mexico 21 west.
While referenced on guide signs from the I-25 mainline at both ends, the route through the city of Springer is otherwise unsigned.
The Raton business route for I-25 follows Second Street north from Exit 450 to the city center, and Canyon Drive back to I-25 at Exit 454. The route along old U.S. 85 & 87 is well posted.
Business Loop I-25 was formerly referenced at Exit 13 along I-25 north for the now removed folded diamond interchange. The route likely took Animas Street southeast to Main Street (old U.S. 160 & 350). A 2009 reconstruction project of I-25 through Trinidad included the replacement of the northbound viaduct section crossing the Purgatorie River. Subsequent work in 2011 reconstructed southbound, with a new diamond interchange built at Main Street to replace the antiquated ramps at University and Animas Street. This resulted in the removal of the Business Loop I-25 signage.
The lone business spur for I-25 angles 1.94 miles southwest from Exit 34 along Lynn Road and Fir Street. Business Spur I-25 follows an old alignment of U.S. 85-87-160. The route concludes with an end sign at the Fir Street intersection with Main Street in Aguilar.
Business Spur I-25 to Aguilar was largely unsigned with only one shield at its western end and no mention from the mainline freeway previously. This changed by August 2012, when ample signs were erected along the entirety of the route and on the Interstate 25 northbound mainline.
The 3.94-mile business loop for Walsenburg runs west from Exit 49 to Main Street (old U.S. 85-87) and the city center. Walsen Avenue extends the route northward to I-25 at Exit 52. U.S. 85 & 87 remain paired with I-25 instead of overlapping with the business route.
U.S. 160 travels 5th Street west from Exit 50 of I-25 to Main Street, where it joins Business Loop I-25 for two blocks south to 7th Street. Shields are posted for U.S. 160 along 5th Street, but signing at Downtown Walsenburg, and on the Interstate 25 mainline, direct motorists following U.S. 160 to use the southern half of Business Loop I-25 instead.
Colorado Springs
The Colorado Springs business route used to extend from Exits 140 to 148 on the east side of Interstate 25 along Nevada Avenue. Like most other business loops along Interstate 25 in Colorado, the route was concurrent with old U.S. 85-87, but neither US route were cosigned with Business Loop I-25 during the 1990s-2000s time frame.
This business loop was 6.75 miles long per CDOT. Actions taken on October 1, 2007 decommissioned the business loop, along with portions of several other state routes in Colorado Springs (such as SH 83 and SH 38) while the new SH 21 (Powers Road) alignment was added at the same time.
Castle Rock
Part of old U.S. 85-87, this loop used to follow Plum Creek Parkway east from Exit 181 to Wilcox Street, and Wilcox Street north to Exit 182. The 1.2 mile route was decommissioned by 1996 and likely was never signed.
Subsequent actions realigned SH 86 away from 5th Street to no longer end at former Business Loop I-25 in Downtown Castle Rock. SH 86 was realigned onto Founders Parkway north to Exit 184 so that it no longer ended at a locally maintained route.
Business Loop I-25 travels 7.9 miles east from I-25 through Cheyenne along side U.S. 87 Business between Exits 7 and 12. The east-west leg of the loop overlaps with Wyoming 212 (College Drive) to Central Avenue, where the route combines with U.S. 85 northward to Interstate 80. There I-180 begins and combines with the three routes along an expressway connecting the freeway with Downtown. The north and southbound directions separate into a couplet of Central and Warren Avenues between Business Loop I-80 (16th Street) and Cheyenne Regional Airport (CYS). Warren Avenue then forms a multi lane arterial through to Central Avenue, which returns the business route to I-25 across from Warren Air Force Base.
See Wyoming @ AARoads - Business Loop I-25 - Cheyenne for the highway guide.
Business Loop I-25 combines with U.S. 87 Business (Yellowstone Highway) along a 3.4 mile route through the town of Chugwater. The route combines with Wyoming 313 east from Exit 54 to 1st Street, where the two join old U.S. 87 to Lone Tree Road. There WYO 313 branches east toward U.S. 85 while Business Loop I-25 parallels I-25 north along side WYO 321 (Ty Road) to Exit 57.
The Wheatland business route for I-25 follows a staggered route through town along a nearly three mile route. Beginning at Exit 78, Business Loop I-25 & U.S. 87 Business take Mariposa Parkway east to 16th Street north and South Street east to Downtown. 9th Street leads the routes north to WYO 320, where the business route loops west to I-25 at Exit 80.
U.S. 20 & 26 overlap with Interstate 25 & U.S. 87 northward to Douglas. Afive-mile business route for I-25 loops through the Converse County seat. The loop doubles as Business routes for all three US highways as it overtakes Yellowstone Highway northwest of Exit 135. The four-way overlap takes Richards Street to 4th Street amd the city center. Center Street takes the batch west to Yellowstone Highway across the North Platte River toward a trumpet interchange (Exit 140) with Interstate 25.
U.S. 20 & 26 split with Interstate 25 & U.S. 87 and remain on their original route west through the town of Glenrock and Casper. Business Loop I-25 overlays the routes from their separation at Exit 160 to the intersection of Birch and 4th Streets. There the seven mile route heads southwest along side an implied concurrency with WYO 95 to end at Exit 165.
Business Loop I-25 in Casper is rarely shown on Casper inset maps. The 2.1 mile route overlaps with U.S. 87 Business and heads south from Exit 186 along Beverly Street, which doubles as U.S. 20-26 east. Business Loop I-25 & U.S. 87 Business turn west onto Yellowstone Highway and merge with U.S. 20 & 26 Business as U.S. 20 & 26 turn east. The four-way overlap proceeds west and shifts onto East 1st Street into Downtown.
U.S. 20 & 26 Business stay on West 1st Street as Business Loop I-25 & U.S. 87 Business follow Center Street to I-25 at Exit 188A. The northbound business route utilizes the F Street service road to reconnect with I-25 at the Poplar Street on-ramp.
Business Loop I-25 in Casper is thoroughly signed, but sometimes with erroneous tri-color Interstate shields as of August 2016.
See Wyoming @ AARoads - Business Loop I-25 - Casper for the highway guide.
Also signed as Business U.S. 87, Business Loop I-25 connects Interstate 25 with Downtown Buffalo and U.S. 16 west across the Bighorn Mountains. The northern half of the 3.4 mile route combines with Business Loop I-90, as it parallels the final 1.25 miles of I-25 to its terminus at I-90.
The route is well posted with business route markers leading toward the city center and trailblazers for I-25 and I-90 on the respective legs outbound.
See Wyoming @ AARoads - Business Loop I-25 - Buffalo for the highway guide.

Page Updated August 24, 2016.

Approaching the Las Vegas, New Mexico business loop for I-25 on Interstate 25 north. Replacement signs here include shields for NM 283 and NM 329. Photo taken by Mike Ballard (1998).
The lone sign posted for Business Loop I-25 on I-25 through Trinidad, Colorado was this panel for Exit 13. Photo taken by Mike Ballard (1998).
Former ground level sign on I-25 north for Business Loop I-25 north into Walsenburg, Colorado. Photo taken by Mike Ballard (1998).
Business Loop I-25, U.S. 85, and U.S. 87 Business southbound reassurance shields posted on Central Avenue in Cheyenne, Wyoming. Photo taken 09/01/04.