List of suffixed Interstate Highways

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Dwight D. Eisenhower National System of Interstate and Defense Highways
The 1958 Interstate Highway System plan included many suffixed Interstates.
System information
Formed: June 29, 1956[1]
Highway names
Interstates: Interstate X (I-X)
System links

Currently the Interstate Highway System includes seven suffixed routes that are signed: the Interstate 35 split into Interstate 35E and Interstate 35W at Dallas-Fort Worth, Texas; a similar split into Interstate 35E and Interstate 35W at Minneapolis-St. Paul, Minnesota; as well as Interstate 69C, Interstate 69E and Interstate 69W in South Texas; in addition, Interstate 480N in Ohio exists and is designated as such on mile markers and exit/entrance ramp signs, but is otherwise unsigned. However, there were once many more, as the three-digit Interstates were not designated until after all major routes were assigned numbers, including some short connections and spurs. (A few of the shortest, including I-190 and I-195, were assigned three-digit numbers almost immediately.) Most were not equal splits like on I-35, but had the main route continue through, and often the suffixed route never returned to its parent. In 1980, AASHTO abolished the majority of suffixes due to confusion, renumbering them as three-digit Interstates, but several that return to their parents were kept. Interstate 15E has since become Interstate 215, but both I-35E/I-35W and I-69 splits still exist.

List of suffixed Interstates

This list is incomplete; you can help by expanding it.
Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-5W — — I-5 in Tracy, California I-5 in Dunnigan, California — — Replaced by I-580, I-80 and I-505
I-5E — — I-5 in Tracy, California I-5 in Dunnigan, California 1958 1982 Replaced by I-5
I-15E — — I-15 in Temecula, California I-15 in Devore, California 1973 1982 Renumbered from I-215 in 1973 and back to I-215 in 1982
I-15W — — I-15 in Pocatello, Idaho I-80N in Rupert, Idaho 1958 — became I-86 in 1980; Was also planned as Interstate 82N
I‑24W — — I-40 in Jackson, Tennessee I-55 in Hayti, Missouri — 1964 Did not connect to I-24; renumbered I-155
I-35W 85.20 137.12 I-35 in Hillsboro, Texas I-35 in Denton, Texas — —
I-35E 96.76 155.72 I-35 in Hillsboro, Texas I-35 in Denton, Texas — —
I-35W — — I-35 in Wichita, Kansas I-70 in Salina, Kansas — 1976[2] Renumbered I-135[2]
I-35W 41.78 67.24 I-35 in Burnsville, Minnesota I-35 in Forest Lake, Minnesota — —
I-35E 39.34 63.31 I-35 in Burnsville, Minnesota I-35 in Forest Lake, Minnesota — —
I‑59B — — Bypass for I-59 around Birmingham, Alabama — — Renumbered I-459
I-69W — — — — — —
I-69C — — — — — —
I-69E — — — — — —
I-70S — — I-70 in Washington, Pennsylvania I-70/I-80S in New Stanton, Pennsylvania 1958 1964 Became part of I-70 and former I-70 became parts of I-79 and I-76
I-70N — — I-70 in Frederick, Maryland I-83/I-95 in Baltimore, Maryland 1958 1973
I-70S — — I-70 in Frederick, Maryland I-66/I-95 in Washington, DC 1958 1973
I-75E — — Bypass for I-75 around Tampa-St. Petersburg, Florida — 1973 Renumbered I-275; later swapped with I-75 in 1980
I‑80N — — I-80 in Echo, Utah I-5 in Portland, Oregon 1958 1980 Became I-84
I‑80S — — I-25/I-70 in Denver, Colorado I-80 in Big Springs, Nebraska 1958 1980 became I-76
I‑80N — — I-80 in Neola, Iowa I-29 in Loveland, Iowa — 1973 Became part of I-680
I-80N — — I-80/I-90 in Norwalk, Ohio I-80 in Edinburg, Ohio 1958 1962
I‑80S — — I-80 in Youngstown, Ohio I-295 in Camden, New Jersey — 1970 Extended west to Lodi, Ohio by 1962 over former I-80; east end truncated to Monroeville, Pennsylvania and the part east of Monroeville renumbered I-76 in 1964; the rest became part of I-76
I-81S — — I-81 in Scranton, Pennsylvania I-80 in Crescent Lake, Pennsylvania — 1964 Formerly I-82, became I-81E (now I-380)
I-81E — — I-81 in Scranton, Pennsylvania I-80 in Scotrun, Pennsylvania 1964 1973 Formerly I-81S, became I-380
I‑82S — — Burley, Idaho Tremonton, Utah 1957 — Became I-84
I-82N — — Burley, Idaho Pocatello, Idaho 1957 — Became I-86
I-90N — — Buffalo, New York Canadian border at Lewiston, New York — 1959 Original designation for I-190 in New York, renamed I-190
I-94N — — Muskegon, Michigan I-94 in Grand Rapids, Michigan 1957 1959
I-180N — — I-80N Boise, Idaho — 1980 This was the only suffixed three-digit Interstate (until I-480N in Ohio was designated); all other spurs of suffixed routes had no suffix; became I-184
I-480N 1.99[3] 3.20 I-480 in Maple Heights US 422 in Warrensville Heights — — Unsigned on guide signs or reassurance markers, although it is signed on mile markers
  •       Former

References

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