Interstate 225

Interstate 225
I-225 highlighted in red
Route information
Maintained by CDOT
Length:	11.959 mi[1] (19.246 km)
Existed:	1976[2] – present
Major junctions
South end:	I-25 / US 87 in Denver
	I-70 Bus. / US 40 / US 287 in Aurora
North end:	I-70 / US 36 in Aurora and Denver
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Colorado State Highways ← SH 224 SH 227 →

Interstate 225 (I-225) is a spur route of Interstate 25 in Colorado. It is the only auxiliary route of Interstate 25, and one of two auxiliary Interstate highways in the state of Colorado. I-225 traverses Aurora and small portions of Denver and Greenwood Village. It runs north from Interstate 25 to Interstate 70. It intersects with Interstate 70 Business/U.S. Highway 40/U.S. Highway 287, known locally as Colfax Avenue. Construction on the freeway began in 1964 and continued progressively through many years until final completion in 1976.

Route description

The southern end of I-225 begins at an interchange with Interstate 25, as a typical two lane interstate with a 65 mph speed limit. The road then traverses from the southern end northeastward through southern Denver, with Cherry Creek State Park and Cherry Creek Lake on its east side.^[3] After exits with DTC Boulevard and Yosemite Street in Greenwood Village,^[4] a large suburb of the Denver-Aurora Metropolitan Statistical Area, the road becomes three lanes with a fourth auxiliary lane traversing the Denver/Greenwood Village city limits. The highway interchanges with State Highway 83 at the northern boundary of Cherry Creek State Park. Following the exit at SH 83, the freeway enters a suburban area of Aurora,^[5] where it turns northward, narrowing back to two lanes and having a 55 mph speed limit, and has exits at Iliff Avenue, Mississippi Avenue, and Alameda Avenue, also signed as State Highway 30.^[6] After crossing Sand Creek, the freeway interchanges with Colfax Avenue, also signed as U.S. Highway 40, U.S. Highway 287 and Interstate 70 Business. After the exit, I-225 enters Adams County, continuing through the city of Aurora. The route then crosses a railroad^[7] and continues north, where it interchanges with Interstate 70.^[1] The northbound ramp to westbound I-70 reenters Denver, and the eastbound I-70 to southbound I-225 ramp originates in Denver but enters Aurora as it passes under the westbound I-70 to southbound I-225 ramp. The highway recently has gone under construction to widen to three lanes in each direction from Colfax to Mississippi, and later will be expanded from Mississippi to Parker, completing construction. The Colfax Avenue exit has also been reconstructed to include a 17th Place ramp for direct access to Anschutz Medical Campus.

History

The Dayton RTD station in Aurora is located in the center of Interstate 225.

Construction on I-225 began in May 1964 at Interstate 70. A section from Colfax Avenue to Sixth Avenue was opened in 1966. Five years later, a segment between Mississippi Avenue and Parker Road was opened, and construction began on another segment south of Parker Road, completed in May 1975. The rest of the route between Yosemite Street and Interstate 25 was completed in May 1976.^[2] Since completion of construction, the road has retained its original designation from I-25 to I-70.^[5]

Exit list

County	Location	Mile[1]	km	Exit	Destinations	Notes
City and County of Denver		0.00	0.00	0	I-25 – Colorado Springs, Denver	Signed as exits 0A (south) and 0B (north)
Arapahoe	Greenwood Village	0.673	1.083	1A	DTC Boulevard, Tamarac Street	Signed as exit 1 northbound
		1.333	2.145	1B	Yosemite Street	Southbound exit
	Aurora	3.946	6.350	4	SH 83 (Parker Road)
		5.373	8.647	5	Iliff Avenue
		6.886	11.082	7	Mississippi Avenue
		7.921	12.748	8	Alameda Avenue
		8.953	14.408	9	SH 30 (6th Avenue)
Adams		9.901	15.934	10A	I-70 Bus. (Colfax Avenue) / US 40 / US 287
		10.151	16.336	10B	17th Place	Southbound exit is via exit 10. Opened on February 15, 2013.[8]
Adams–Denver line	Aurora–Denver line	11.997	19.307	12	I-70 / US 36 – Denver, Limon	Signed as exits 12A (west) and 12B (east)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Incomplete access

See also

• Colorado portal
• U.S. Roads portal

References

External links

• Colorado Routes 200-233