Interstate 35 serves the heartland of America, connecting South Texas with the Arrowhead of Minnesota. Starting in Laredo, IH 35 ventures north through an arid region to San Antonio, where it briefly overlaps with Interstate 10 by Downtown. The freeway angles northeast from there along a busy corridor to the capital city of Austin, Waco and Hillsboro where it partitions into east and west branches. Interstate 35W serves Fort Worth while Interstate 35E retains the exit numbering scheme of IH 35 through Dallas. The two reconvene at Denton, where IH 35 resumes a northward heading to Gainesville and a crossing of the Red River into Oklahoma.
Leaving the Lone Star State behind, Interstate 35 travels north to Ardmore and the scenic Arbuckle Mountains ahead of Pauls Valley. The freeway continues to Norman, home of the University of Oklahoma, and Moore, a south suburb of Oklahoma City. Once in OKC, I-35 sees overlaps with Interstate 40 to the southeast of Downtown and with Interstate 44 from Lake Aluma and Lake Arcadia. The freeway advances from Edmond and the northern suburbs along a rural course to the Kansas Turnpike and Wichita.
The northern heading of Interstate 35 shifts northeastward at Wichita, with Interstate 135 (Former Interstate 35W) branching northward to Salina and Interstate 70. I-35 remains along the tolled Kansas Turnpike northeast to El Dorado and Emporia, where it splits for an easterly route via Ottawa and Olathe. Turning more northeast, I-35 progresses through Overland Park, Shawnee and other suburban cities to Kansas City, Kansas and Downtown Kansas City, Missouri.
Interstates 29, 35, 70 and 670 come together to encircle the central business district of Kansas City. These routes form an inner belt, and the exits along the route are all numbered 2 and a suffix. This is known as the Alphabet Loop, as all lettered suffixes are used from 2A through 2Y except for the letters I and O. I-35 briefly overlaps with I-70 on the north side of Downtown and with I-29 from the split with I-70 to Avondale.
Heading away from Kansas City, Interstate 35 remains suburban to Liberty and the split with U.S. 69. This stretch is home to a signing anomaly, as Missouri 110, the Chicago Kansas City Expressway, takes precedences on reassurance markers posted along the freeway mainline from Interstate 435 northward to Cameron. This MoDOT signing practice also exists along Interstate 44 where it overlaps with U.S. 50 to the southwest of St. Louis. There I-44 is omitted in favor of U.S. 50, as I-35 is in favor of MO 110.
The terrain becomes hilly as Interstate 35 advances northward to Bethany. Crossing the Iowa state line continues by Lamoni to Osceola and the capital city of Des Moines. There the freeway combines with Interstate 80 to the west and north of the city while Interstate 235 serves interests to Downtown. I-35 otherwise exits the Des Moines area via Ankeny for the home of Iowa State University, Ames, and Mason City.
The Avenue of the Saints Corridor, Iowa 27, accompanies Interstate 35 north from U.S. 18 and Clear Lake into southern Minnesota. A short distance beyond the state line is Albert Lea and the crossroads with Interstate 90. The rural freeway journeys north from there to Owatonna, Faribault and the Minneapolis-St. Paul area.
Like Dallas-Fort Worth in Texas, Interstate 35 again partitions into separate branches. Interstate 35W stays northward from Burnsville to Bloomington, Downtown Minneapolis, Mounds View and Lino Lakes while Interstate 35E continues the I-35 exit numbers northeast to Apple Valley, St. Paul, White Bear Lake and Centerville. The remainder of I-35 extends northward from near Forest Lake to Hinckley, Moose Lake and the Twin Ports of Duluth and Superior, Wisconsin.
Proponents of the Interstate 35 Corridor refer to it as the “real” NAFTA (North American Free Trade Agreement) highway, since the proposed NAFTA Highway (Interstate 69) is currently incomplete. I-35, together with Interstate 29, provides a direct freeway connection between Mexico and Canada. Interstate 35 begins at the International Border with Mexico at Laredo and terminates at Duluth, Minnesota, 148 miles southwest of the Canadian line, thus nearly affording it border-to-border status.
High Priority Corridor
Interstate 35 in its entirety is part of High Priority Corridor 23: Interstate Route 35 Corridor.
Parallel U.S. Routes
Interstate 35 replaced all of U.S. 81 from Laredo north to Hillsboro (I-35W replaced U.S. 81 northward to Blue Mound and Wautaga). The southernmost 18 miles doubles as U.S. 83 as well. Overlaps further north include U.S. 190 between Belton and Temple, U.S. 77 from Waco to Hillsboro (I-35E maintains an unsigned overlap with U.S. 77 northward through Dallas) and U.S. 77 again from Denton to Exit 1 in Oklahoma. U.S. 77 parallels or overlaps with I-35 through Oklahoma to Tonkawa. Shorter overlaps also exist in the Sooner State with U.S. 70 and U.S. 64.
U.S. 81 rejoins the Interstate 35 corridor from South Haven to Wichita in southern Kansas. Where I-35 leaves the Kansas Turnpike, U.S. 50 takes over as the parallel highway or cosigned route. The pair head east from Emporia to Interstate 435, where U.S. 50 parts ways for Lees Summit, Missouri. U.S. 56 east from Gardner and U.S. 169 north from Olathe also join I-35 northward to Overland Park. There U.S 69 briefly forms a four-way overlap with the freeway before U.S. 56 & 169 separate for Shawnee Mission Parkway at Merriam. U.S. 69 follows suit and parts ways for the 18th Street Expressway north into Kansas City.
The Alphabet Loop also sees U.S. 24, 40, 71 and 169 tie in at various locations. Heading north from there, U.S. 71 accompanies the I-29 & 35 overlap, staying with Interstate 29 to St. Joseph. This leaves I-35 to travel solo briefly before U.S. 69 rejoins the corridor from Claycomo north to Osceola, Iowa and again from Des Moines to Blairsburg.
U.S. 18 overlaps with I-35 at Clear Lake. Northward into Minnesota, U.S. 65 and U.S. 69 come to separate ends at Albert Lea. U.S. 69 ends at Minnesota 13 (former U.S. 16) west of Downtown while U.S. 65 ends at I-35 south of Interstate 90. U.S. 65 historically ran north along what is now I-35 to Minneapolis. Another truncated route, U.S. 8, paralleled / overlapped with I-35W from Downtown Minneapolis to Forest Lake. The route now begins at I-35, one exit south of the truncated end of U.S. 61. Historic U.S. 61 lines the I-35 corridor northward from Wyoming to Duluth.
Until 2013, when Interstates 69C and 69E were established, the only two remaining split routes (route numbers with a letter suffix indicating direction) in the Interstate Highway System were the Interstate 35 branches through Dallas/Ft. Worth and Minneapolis/St. Paul. The other suffixed route along I-35, Interstate 35W between Wichita and Salina, was replaced with Interstate 135 in 1976.
Within Texas, Interstate 35 was an original Interstate Highway, and it was approved by the Texas State Highway Commission in 1962 with 492 miles (figure includes both Interstate 35E and 35W).7 The segment of Interstate 35 through Austin was completed in 1962.
Within Oklahoma, the first section of Interstate 35 to be opened to traffic was the four-mile connection from U.S. 177 (Exit 232) north to the Kansas Turnpike. This connection opened on April 22, 1958, and it was considered to be the first Interstate highway to cross state lines and connect to another state.9
Interstate 35 through the Ardmore, Oklahoma area in Carter County was reconstructed in a two phase project. The first phase encompassed seven miles of I-35 from a point seven miles north of U.S. 70 to the Murray County line (Exits 40 to 47). This portion of the overall 12-mile project was completed in fall of 2003. The second phase of the project began ran throughout 2004.1
Further north, an Interstate 35 long-term widening and reconstruction project entered its final phase in 2003. A 14-month project expanded a 1.5-mile segment between S.E. 82nd Street and S.E. 66th Street in Oklahoma City. The new travel lanes were built within the median of the existing right of way. This stretch of freeway accommodated 74,000 vehicles per day (vpd) at the time. Upon completion, the $23 million project concluded the overall I-35 widening from the city of Norman northward to Interstate 40 in Oklahoma City.2
North End – Duluth, MN
South End – Laredo, TX
Branch Routes – 9
Total Mileage – 1,568.38
Texas – 504.15*
Cities – Laredo, Pearsall, San Antonio, Austin, Georgetown, Temple, Waco, Hillsboro, Waxahachie, Dallas, Denton, Gainesville
Oklahoma – 235.96
- Cities – Ardmore, Pauls Valley, Norman, Oklahoma City, Guthrie, Perry
- Junctions –
Kansas – 235.51
Cities – Wichita, Emporia, Ottawa, Olathe, Kansas City
Missouri – 114.74
Cities – Kansas City, Cameron
- Junctions –
Iowa – 218.33
Cities – Des Moines, Ames
- Junctions –
Minnesota – 259.69
Cities – Albert Lea, Owatonna, Faribault, St. Paul, Duluth
Source: December 31, 2018 Interstate Route Log and Finders List
I-35 in Oklahoma was named the Raymond Gary Expressway per state legislation in 1957 after the Governor in office at the time (1955-59). Signs were taken down by the time Gary’s predecessor J. Howard Edmonsdon took office and few know of the designation today.14
Interstate 35 was built from Ottawa northeast to Kansas City during the late 1960s.6
Due to the efforts by Mason City officials, the planned alignment of Interstate 35 shifted eastward to run closer to U.S. 65 from Latimer to Clear Lake on September 1, 1965. This included a reroute northeast through Wright and Franklin Counties across what was known as the “Mason City Diagonal.” The alignment shift was contested by area farmers with litigation. This delayed construction until 1972.15
Early Interstate system maps show Interstate 35 proposed along the U.S. 69 corridor from Iowa to an overlap with Interstate 90 across Albert Lea.
The overlap between Interstates 35 and 90 was no longer proposed by 1964, with I-35 shifted to the southeast of Albert Lea. Another change was made by 1965 when I-35 was realigned again to run south midway between U.S. 65 and 69, coinciding with the Iowa change of the freeway corridor.
Interstate 35 had the following highlights in its Kansas history:6
- U.S. 24, 40, 69, 75 (Topeka to Nebraska), and 81 were first considered as potential Interstate routes by Kansas on June 5, 1945. A subsequent submission by the Kansas State Highway Commission on May 22, 1946, resulted in three primary routes to be considered by the federal government: Route 1 (today’s Interstate 70), Route 2 (today’s Interstate 35), and Route 3 (today’s Kansas 66; Interstate 44 avoids the Sunflower State).
- The section of Interstate 35 that overlays the Kansas Turnpike was constructed in 1955 and 1956, with the entire turnpike opening on October 21, 1956.
- The portions of the Kansas Turnpike that carry Interstate 35, Interstate 70, and Interstate 470 were approved as part of the Interstate Highway System by the Federal Highway Administration (FHWA) in 1957. Interstate 335 was designated for the remaining unnumbered section of the Kansas Turnpike in 1987.
- Interstate 35 was designated by AASHTO on August 14, 1957, as an original Interstate Highway from Laredo north to Duluth.
- During the late 1960s, most of Interstate 35 (Kansas) from Ottawa to Kansas City (excluding the segment around Emporia) was constructed and opened to traffic.
- In 1974, the ten-mile section from the Kansas Turnpike around Emporia was completed and opened to traffic. At that time, Interstate 35 was complete in Kansas.
Within Kansas City, Missouri, the Paseo suspension bridge over the Missouri River was replaced by a seven-lane cable stay bridge. Named the Christopher S. Bond Bridge, construction began on April 21, 2008. The span cost $245 million, of which $195 million was derived from Missouri Amendment 3 and $50 million from federal SAFETEA-LU funds. The Interstate 29/35 Connections Project was mostly finished in December 2010, when MoDOT opened all ramps and lanes on the new bridge. This was accomplished on budget and six months ahead of schedule. Touch-up work however continued to July 3, 2011, when the multi-colored LED lighting system went operational.13
Interstate 35 was opened in Iowa during phases between 1958 and 1975.4 5
- Missouri state line to Iowa 2: December 2, 1970
- Iowa 2 to U.S. 34: December 17, 1969
- U.S. 34 to Iowa 152: August 30, 1960
- Iowa 152 to Iowa 92: November 26, 1958
- Iowa 92 to County Route G-14: October 5, 1958
- County Route G-14 to Douglas Avenue: September 21, 1958
- Douglas Avenue to Exit 131, Merle Hay Road: November 9, 1958
- Exit 131, Merle Hay Road to U.S. 69 (Exit 136): November 26, 1958
- U.S. 69 (Exit 136) and Interstate 235 South and Interstate 80 East: November 17, 1960
- Interstate 80 to U.S. 30: November 11, 1965
- U.S. 30 to U.S. 20: December 6, 1967
- U.S. 20 to Iowa 106: November 14, 1975
- Iowa 106 to Iowa 9: August 7, 1971
- Iowa 9 to Minnesota state line : December 12, 1972
Within Minnesota, the first section of Interstate 35 to open was between Owatonna and Medford in 1958. The last section of Interstate 35E through St. Paul, Minnesota, opened to traffic on October 15, 1990.8
Interstate 35 through Duluth concludes after a series of cut and cover tunnels at what was the largest public works project in northeastern Minnesota. This stretch of freeway was proposed in 1958 by the Federal Highway Administration. It extended I-35 3.2 miles to the East End residential district of Duluth, but not the Two Harbors Expressway as originally envisioned. The cut back from the Expressway as approved by a residential vote,11 allowed $55 million in funds to be used for bridge and road work in Downtown Duluth. The initial 1.4 mile stretch of the $200-million12 extension opened on October 29, 1987.10 It includes the 500 foot long Lakeplace Park tunnel.11
Interstate 35 was again extended on November 21, 1989, when an 18-block section of the freeway opened. Included on this stretch are 600 foot and 700 foot long tunnels. The trenched freeway design of I-35 using tunnels spared the historic Fitger’s Brewery, two other historic buildings and the rose garden in Leif Erikson Park.11
A ribbon cutting ceremony finalized the 3.2 mile Duluth Extension of I-35, when the 36-block section of freeway was finally completed on October 28, 1992. Capping 11 years of construction, the fourth tunnel (Leif Erikson Tunnel) in Duluth opened to traffic as Minnesota’s second longest tunnel. The tunnel passes under Leif Erikson Park at a total length of 1,480 feet (which is 12 feet shorter than the Lowry Tunnel on I-94 in Minneapolis). The I-35 Extension won the Federal Highway Administration’s 1991 Excellence in Highway Design award.12
Also within the state of Minnesota, Interstate 35 between Minneapolis and Duluth is designated the “Red Bull Division Highway.” The legislation for the memorial was approved in 2000.3
North End – Duluth, Minnesota
London Road north at
North End Throwback
South End – Laredo, Texas
Traffic at the south end of IH 35 transitions onto Santa Ursula Avenue (Business Loop I-35) ahead of both the couplet of Houston and Matamoros Streets (U.S. 83 & SH 359) and the Juarez-Lincoln International Bridge. U.S. 83 continues south from Laredo to McAllen, Harlingen and Brownsville, mostly along a two-lane highway, U.S. 83 becomes a part of IH 2 within the Lower Rio Grande Valley. Long range plans call for IH 2 to extend northwest to Laredo. Photo taken 08/04/19.
Business Loop I-35 links the ending IH 35 with the Gateway to the Americas International Bridge to Nuevo Laredo at the south end of Downtown. The route navigates five blocks west along Houston Street to Salinas Avenue south and the former end of U.S. 81. Convent Avenue returns the loop northward. Photo taken 08/04/19.
North South at
San Dario Avenue forms an east side frontage street to IH 35 northward throughout the city of Laredo. Pictured here are shields for IH 35, U.S. 59 and U.S. 83 at the freeway beginning.
U.S. 59 formerly ended at Exit 2 (Lafayette Street), but was relocated northward when IH 69W was designated in 2014. Photo taken 08/04/19.
- “I-35 narrowed near Ardmore.” Oklahoma DOT Public Affairs Media Advisory, March 06, 2003.
- “The long-awaited widening of I-35 to begin!”
- Copeland, Brian. “I-35 in Minnesota designated as Red Bull Division Highway.” Personal email, November 18, 2003.
- “Iowa Completion Status of Interstate System as of January 1, 1982.” Iowa Department of Transportation.
- Forty Years of Iowa Interstates.
- Kansas Interstate 50th Anniversary
- “From Anywhere to Everywhere: The Development of the Interstate Highway System in Texas”
http://tti.tamu.edu/interstate_anniversary/white_paper/by Penny Beaumont, Rhonda Brinkmann, David Ellis, Chris Pourteau, and Brandon V. Webb, Texas Transportation Institute, page 29.
- Celebrating the 50th Anniversary of the Eisenhower Interstate Highway System: Previous Interstate Facts of the Day by the Federal Highway Administration (FHWA).
- Celebrate the Interstate: America’s Interstate Highway System Turns 50!
http://www.okladot.state.ok.us/okinterstate50/by the Oklahoma Department of Transportation.
- “Duluth opens the first section of I-35 extension.” Star Tribune: Newspaper of the Twin Cities, October 30, 1987.
- “Section of I-35 opening in Duluth features tunnels, waterfront park.” Star Tribune: Newspaper of the Twin Cities, November 19, 1989.
- “In Duluth , the end of the road – Final part of I-35 will be opened on Wednesday” Star Tribune: Newspaper of the Twin Cities, October 25, 1992.
- Kidwell, Brian. “KcICON Quarterly Project Newsletter.” (June 2011).
- “Famous, Infamous Get Roads, Bridges Named After Them.” NewsOK, October 30, 1983.
- I-35, Iowa Highways Page.
Page updated August 10, 2019.