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In 1998, with the Interstate System essentially complete, FHWA's Office of Engineering compiled information about development of the program. In making this information available to the public, we have not updated the material. All information is as of 1998 when the Office of Engineering compiled the report.
The Dwight D. Eisenhower System of Interstate and Defense Highways
Part VI - Interstate Status and Progress
Bulletin
Subject: Status of Development of the Dwight D. Eisenhower System of Interstate and Defense Highways as of December 31, 1997
Date: January 7, 1998
More than 99.9 percent, or 68,859 kilometers (42,787 miles), of the 68,871 kilometers (42,794 miles) Interstate System is now in use. Since December 31,1996,19 kilometers (12 miles) were put into service. Total kilometers now open to traffic includes 64,920 kilometers (40,339 miles) which are complete or essentially complete. The other 3,939 open kilometers (2,447 miles) include 146 kilometers (91 miles) requiring major improvements to bring them to full Interstate standards, 3,593 kilometers (2,232 miles) of toll facilities, and 200 kilometers (124 miles) currently under improvement or still requiring additional minor work to complete initial construction.
The status of the Interstate System as of December 31, 1997, is shown on the accompanying map and tables. Table I shows the status of improvements for each State. The following is a summary of this information:
| | Kilometers | Miles | Percent |
Open to traffic
(Includes 3,593 kilometers or 2,232 miles
of Toll Roads) | 68,859 | 42,787 | 99.98 |
| Under Basic Construction | 4 | 2 | 0.01 |
| Engineering and Right-of-Way Acquisition | 8 | 5 | 0.01 |
| Total | 68,871 | 42,794 | 100.0 |
Table II is a listing of the 12 kilometers (8 miles) not open to traffic which identifies in each State, the route and location of each section not open.
Dwight A. Horne
Chief, Federal-Aid and Design Division
English System
MILEAGE DESIGNATED UNDER SECTIONS 103(e)(1),(2), AND (3) OF TITLE 23 U.S.C.
| State | Not Open to Traffic | Open to Traffic | Total Designated System** |
| Engr. or Row | Under Basic Constr. | Total | Total Facil. | Adequate for Present Traffic | Minor Work Remaining | Complete or Essent. Complete | Total |
| ALABAMA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 20.20 | 885.00 | 905.20 | 905.20 |
| ARIZONA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,167.45 | 1,167.45 | 1,167.45 |
| ARKANSAS | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 526.34 | 526.34 | 526.34 |
| CALIFORNIA | 0.70 | 0.00 | 0.70 | 10.00 | 0.00 | 35.80 | 2,265.01 | 2,310.81 | 2,311.51 |
| COLORADO | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 950.76 | 950.76 | 950.76 |
| CONNECTICUT | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 291.04 | 291.04 | 291.04 |
| DELAWARE | 0.00 | 0.00 | 0.00 | 14.30 | 0.00 | 0.00 | 26.31 | 40.61 | 40.61 |
| DIST. OF COL. | 1.30 | 0.00 | 1.30 | 0.00 | 0.00 | 5.17 | 7.18 | 12.35 | 13.65 |
| FLORIDA | 0.00 | 0.00 | 0.00 | 86.66 | 0.00 | 0.00 | 1,373.53 | 1,460.19 | 1,460.19 |
| GEORGIA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,200.86 | 1,200.86 | 1,200.86 |
| HAWAII | 0.00 | 0.00 | 0.00 | 0.00 | 12.26 | 0.00 | 38.96 | 51.22 | 51.22 |
| IDAHO | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 611.66 | 611.66 | 611.66 |
| ILLINOIS | 0.00 | 0.00 | 0.00 | 155.39 | 0.00 | 0.00 | 1,559.71 | 1,715.10 | 1,715.10 |
| INDIANA | 0.00 | 0.00 | 0.00 | 156.90 | 0.00 | 0.00 | 979.65 | 1,136.55 | 1,136.55 |
| IOWA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 782.06 | 782.06 | 782.06 |
| KANSAS | 0.00 | 0.00 | 0.00 | 178.45 | 0.00 | 0.00 | 642.73 | 821.18 | 821.18 |
| KENTUCKY | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 740.54 | 740.54 | 740.54 |
| LOUISIANA | 0.00 | 0.00 | 0.00 | 0.00 | 15.75 | 3.16 | 853.11 | 872.02 | 872.02 |
| MAINE | 0.00 | 0.00 | 0.00 | 54.48 | 0.00 | 0.00 | 260.60 | 315.08 | 315.08 |
| MARYLAND | 0.00 | 0.00 | 0.00 | 20.15 | 13.22 | 0.00 | 357.17 | 390.54 | 390.54 |
| MASSACHUSETTS | 0.00 | 2.40 | 2.40 | 132.83 | 2.90 | 0.00 | 323.98 | 459.71 | 462.11 |
| MICHIGAN | 0.00 | 0.00 | 0.00 | 5.30 | 0.00 | 1.10 | 1,167.60 | 1,174.00 | 1,174.00 |
| MINNESOTA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 912.70 | 912.70 | 912.70 |
| MISSISSIPPI | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 683.20 | 683.20 | 683.20 |
| MISSOURI | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,153.35 | 1,153.35 | 1,153.35 |
| MONTANA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,187.54 | 1,187.54 | 1,187.54 |
| NEBRASKA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 481.48 | 481.48 | 481.48 |
| NEVADA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 543.44 | 543.44 | 543.44 |
| NEW HAMPSHIRE | 0.00 | 0.00 | 0.00 | 21.35 | 0.00 | 0.00 | 197.66 | 219.01 | 219.01 |
| NEW JERSEY | 0.00 | 0.00 | 0.00 | 90.08 | 7.30 | 2.80 | 321.65 | 421.83 | 421.83 |
| NEW MEXICO | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 999.90 | 999.90 | 999.90 |
| NEW YORK | 0.00 | 0.00 | 0.00 | 478.78 | 0.90 | 0.00 | 912.87 | 1,392.55 | 1,392.55 |
| NORTH CAROLINA | 0.00 | 0.00 | 0.00 | 0.00 | 12.92 | 0.71 | 833.99 | 847.62 | 847.62 |
| NORTH DAKOTA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 571.19 | 571.19 | 571.19 |
| OHIO | 1.60 | 0.10 | 1.70 | 206.20 | 17.14 | 0.00 | 1,305.35 | 1,528.69 | 1,530.39 |
| OKLAHOMA | 0.00 | 0.00 | 0.00 | 174.08 | 0.00 | 1.77 | 632.80 | 808.65 | 808.65 |
| OREGON | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 720.42 | 720.42 | 720.42 |
| PENNSYLVANIA | 1.50 | 0.00 | 1.50 | 360.33 | 0.00 | 34.42 | 1,166.50 | 1,561.25 | 1,562.75 |
| RHODE ISLAND | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 70.82 | 70.82 | 70.82 |
| SOUTH CAROLINA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 6.41 | 765.60 | 772.01 | 772.01 |
| SOUTH DAKOTA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 678.73 | 678.73 | 678.73 |
| TENNESSEE | 0.00 | 0.00 | 0.00 | 0.00 | 6.80 | 0.00 | 1,030.10 | 1,036.90 | 1,036.90 |
| TEXAS | 0.00 | 0.00 | 0.00 | 0.00 | 1.31 | 0.42 | 3,160.85 | 3,162.58 | 3,162.58 |
| UTAH | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 941.32 | 941.32 | 941.32 |
| VERMONT | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 320.44 | 320.44 | 320.44 |
| VIRGINIA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 12.50 | 1,052.84 | 1,065.34 | 1,065.34 |
| WASHINGTON | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 763.85 | 763.85 | 763.85 |
| WEST VIRGINIA | 0.00 | 0.00 | 0.00 | 87.17 | 0.00 | 0.00 | 427.94 | 515.11 | 515.11 |
| WISCONSIN | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 578.09 | 578.09 | 578.09 |
| WYOMING | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 913.61 | 913.61 | 913.61 |
| TOTAL | 5.10 | 2.50 | 7.60 | 2,232.45 | 90.50 | 124.46 | 40,339.48 | 42,786.89 | 42,794.49 |
| PERCENT | 0.01% | 0.01% | 0.02% | 5.22% | 0.21% | 0.29% | 94.26% | 99.98% | 100.00% |
Metric System
MILEAGE DESIGNATED UNDER SECTIONS 103(e)(1),(2), AND (3) OF TITLE 23 U.S.C.
| State | Not Open to Traffic | Open to Traffic | Total Designated System** |
| Engr. or Row | Under Basic Constr. | Total | Total Facil. | Adequate for Present Traffic | Minor Work Remaining | Complete or Essent. Complete | Total |
| ALABAMA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 32.51 | 1,424.27 | 1,456.78 | 1,456.78 |
| ARIZONA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,878.83 | 1,878.83 | 1,878.83 |
| ARKANSAS | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 847.06 | 847.06 | 847.06 |
| CALIFORNIA | 1.13 | 0.00 | 1.13 | 16.09 | 0.00 | 57.61 | 3,645.18 | 3,718.89 | 3,720.01 |
| COLORADO | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,530.10 | 1,530.10 | 1,530.10 |
| CONNECTICUT | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 468.38 | 468.38 | 468.38 |
| DELAWARE | 0.00 | 0.00 | 0.00 | 23.01 | 0.00 | 0.00 | 42.34 | 65.36 | 65.36 |
| DIST. OF COL. | 2.09 | 0.00 | 2.09 | 0.00 | 0.00 | 8.32 | 11.56 | 19.88 | 21.97 |
| FLORIDA | 0.00 | 0.00 | 0.00 | 139.47 | 0.00 | 0.00 | 2,210.48 | 2,349.95 | 2,349.95 |
| GEORGIA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,932.60 | 1,932.60 | 1,932.60 |
| HAWAII | 0.00 | 0.00 | 0.00 | 0.00 | 19.73 | 0.00 | 62.70 | 82.43 | 82.43 |
| IDAHO | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 984.37 | 984.37 | 984.37 |
| ILLINOIS | 0.00 | 0.00 | 0.00 | 250.08 | 0.00 | 0.00 | 2,510.11 | 2,760.19 | 2,760.19 |
| INDIANA | 0.00 | 0.00 | 0.00 | 252.51 | 0.00 | 0.00 | 1,576.59 | 1,829.10 | 1,829.10 |
| IOWA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,258.60 | 1,258.60 | 1,258.60 |
| KANSAS | 0.00 | 0.00 | 0.00 | 287.19 | 0.00 | 0.00 | 1,034.37 | 1,321.56 | 1,321.56 |
| KENTUCKY | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,191.78 | 1,191.78 | 1,191.78 |
| LOUISIANA | 0.00 | 0.00 | 0.00 | 0.00 | 25.35 | 5.09 | 1,372.95 | 1,403.38 | 1,403.38 |
| MAINE | 0.00 | 0.00 | 0.00 | 87.68 | 0.00 | 0.00 | 419.40 | 507.07 | 507.07 |
| MARYLAND | 0.00 | 0.00 | 0.00 | 32.43 | 21.28 | 0.00 | 574.81 | 628.51 | 628.51 |
| MASSACHUSETTS | 0.00 | 3.86 | 3.86 | 213.77 | 4.67 | 0.00 | 521.40 | 739.83 | 743.69 |
| MICHIGAN | 0.00 | 0.00 | 0.00 | 8.53 | 0.00 | 1.77 | 1,879.07 | 1,889.37 | 1,889.37 |
| MINNESOTA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,468.85 | 1,468.85 | 1,468.85 |
| MISSISSIPPI | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,099.50 | 1,099.50 | 1,099.50 |
| MISSOURI | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,856.14 | 1,856.14 | 1,856.14 |
| MONTANA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,911.16 | 1,911.16 | 1,911.16 |
| NEBRASKA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 774.87 | 774.87 | 774.87 |
| NEVADA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 874.58 | 874.58 | 874.58 |
| NEW HAMPSHIRE | 0.00 | 0.00 | 0.00 | 34.36 | 0.00 | 0.00 | 318.10 | 352.46 | 352.46 |
| NEW JERSEY | 0.00 | 0.00 | 0.00 | 144.97 | 11.75 | 4.51 | 517.65 | 678.87 | 678.87 |
| NEW MEXICO | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,609.18 | 1,609.18 | 1,609.18 |
| NEW YORK | 0.00 | 0.00 | 0.00 | 770.52 | 1.45 | 0.00 | 1,469.12 | 2,241.09 | 2,241.09 |
| NORTH CAROLINA | 0.00 | 0.00 | 0.00 | 0.00 | 20.79 | 1.14 | 1,342.18 | 1,364.11 | 1,364.11 |
| NORTH DAKOTA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 919.24 | 919.24 | 919.24 |
| OHIO | 2.57 | 0.16 | 2.74 | 331.85 | 27.58 | 0.00 | 2,100.76 | 2,460.19 | 2,462.92 |
| OKLAHOMA | 0.00 | 0.00 | 0.00 | 280.15 | 0.00 | 2.85 | 1,018.39 | 1,301.40 | 1,301.40 |
| OREGON | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,159.40 | 1,159.40 | 1,159.40 |
| PENNSYLVANIA | 2.41 | 0.00 | 2.41 | 579.89 | 0.00 | 55.39 | 1,877.30 | 2,512.59 | 2,515.00 |
| RHODE ISLAND | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 113.97 | 113.97 | 113.97 |
| SOUTH CAROLINA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 10.32 | 1,232.11 | 1,242.43 | 1,242.43 |
| SOUTH DAKOTA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,092.31 | 1,092.31 | 1,092.31 |
| TENNESSEE | 0.00 | 0.00 | 0.00 | 0.00 | 10.94 | 0.00 | 1,657.79 | 1,668.73 | 1,668.73 |
| TEXAS | 0.00 | 0.00 | 0.00 | 0.00 | 2.11 | 0.68 | 5,086.89 | 5,089.68 | 5,089.68 |
| UTAH | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,514.91 | 1,514.91 | 1,514.91 |
| VERMONT | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 515.70 | 515.70 | 515.70 |
| VIRGINIA | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 20.12 | 1,694.38 | 1,714.50 | 1,714.50 |
| WASHINGTON | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,229.30 | 1,229.30 | 1,229.30 |
| WEST VIRGINIA | 0.00 | 0.00 | 0.00 | 140.29 | 0.00 | 0.00 | 688.70 | 828.99 | 828.99 |
| WISCONSIN | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 930.35 | 930.35 | 930.35 |
| WYOMING | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1,470.31 | 1,470.31 | 1,470.31 |
| TOTAL | 8.21 | 4.03 | 12.24 | 3,592.78 | 145.65 | 200.30 | 64,920.10 | 68,858.82 | 68,871.06 |
| PERCENT | 0.01% | 0.01% | 0.02% | 5.22% | 0.21% | 0.29% | 94.26% | 99.98% | 100.00% |
Interstate Status
As of December 31, 1997, all but 7.60 miles of the 42,794-mile Interstate System as designated under Sections 103(e)(1), (2), or (3) of Title 23 were completed and open to traffic. The status of these 7.60 miles is shown in the following table:
| Sections Not Open to Traffic, but Fully (or Partially) Under Construction As of December 31, 1997 |
| Massachusetts | 2.40 miles | I-90, Third Harbor Tunnel and approaches |
| Ohio | 0.10 miles | I-670, Connector near downtown Columbus |
| | 2.50 miles | |
| Sections Not Open to Traffic, and Not Under Construction as of December 31, 1997 |
| California | 0.70 miles | I-580 @ Alameda |
| Dist of Columbia | 1.30 miles | I-295, Barney Circle Connector |
| Ohio | 1.60 miles | I-670, Columbus Inner Connector |
| Pennsylvania | 1.50 miles | I-95, Interchange with PA Turnpike |
| | 5.10 miles | |
| Note: In addition to the 7.6 miles not open to traffic, there is some remaining Interstate Construction funded work not complete on sections already open to traffic. This work includes major upgradings, added lanes, stage construction, etc. and was reported in the 1991 Interstate Cost Estimate. |
States With All Interstate System Mileage Open To Traffic As of December 31, 1997
Ranked by Date Opened To Traffic
(Based on FHWA PR-511 Records)
| 1 | Rhode Island | 6/75 |
| 2 | Nebraska | 11/76 |
| 3 | Delaware | 6/77 |
| 4 | North Dakota | 11/79 |
| 5 | Wisconsin | 6/82 |
| 6 | Arkansas | 12/82 |
| 7 | Vermont | 12/82 |
| 8 | South Dakota | 10/83 |
| 9 | New Mexico | 8/84 |
| 10 | Iowa | 9/85 |
| 11 | Wyoming | 10/85 |
| 12 | Nevada | 5/86 |
| 13 | Kentucky | 9/86 |
| 14 | Maine | 11/86 |
| 15 | Tennessee | 4/87 |
| 16 | Mississippi | 2/88 |
| 17 | Illinois | 8/88 |
| 18 | West Virginia | 8/88 |
| 19 | Montana | 9/88 |
| 20 | Missouri | 9/88 |
| 21 | New Hampshire | 11/88 |
| 22 | Oklahoma | 4/89 |
| 23 | Georgia | 12/89 |
| 24 | Oregon | 12/89 |
| 25 | Kansas | 1/90 |
| 26 | Idaho | 6/90 |
| 27 | Maryland | 6/90 |
| 28 | Indiana | 8/90 |
| 29 | Arizona | 8/90 |
| 30 | Utah | 11/90 |
| 31 | Minnesota | 5/91 |
| 32 | Virginia | 6/92 |
| 33 | Connecticut | 6/92 |
| 34 | Texas | 10/92 |
| 35 | North Carolina | 10/92 |
| 36 | Washington | 9/93 |
| 37 | Colorado | 9/93 |
| 38 | Florida | 3/94 |
| 39 | Alabama | 10/94 |
| 40 | New Jersey | 12/94 |
| 41 | South Carolina | 8/95 |
| 42 | New York | 12/95 |
| 43 | Louisiana | 5/96 |
| 44 | Michigan | 7/97 |
| 45 | Hawaii | 12/97 |
MILEAGE DESIGNATED UNDER SECTIONS 103(e)(1),(2), AND (3) OF TITLE 23 U.S.C.
| Calendar Year | Not Open to Traffic | Open to Traffic | Total Designated System |
| Prelim Status | PE or R/W | Under Basic Constr | Total | Toll Roads | Adequate for Present Traffic | Minor Work Remaining | Complete Non-Toll | Total |
| 1997 | 0.00 | 5.10 | 2.50 | 7.60 | 2,232.45 | 90.50 | 124.46 | 40,339.48 | 42,786.89 | 42,794.49 |
| 1996 | 0.00 | 5.40 | 14.15 | 19.55 | 2,232.45 | 95.11 | 201.08 | 40,246.30 | 42,774.94 | 42,794.49 |
| 1995 | 0.00 | 5.40 | 24.97 | 30.37 | 2,232.45 | 100.88 | 258.75 | 40,172.04 | 42,764.12 | 42,794.49 |
| 1994 | 0.00 | 5.80 | 39.65 | 45.45 | 2,232.45 | 107.23 | 310.70 | 40,098.66 | 42,749.04 | 42,794.49 |
| 1993 | 0.00 | 4.30 | 49.87 | 54.17 | 2,232.45 | 145.71 | 371.97 | 39,991.29 | 42,741.42 | 42,795.59 |
| 1992 | 0.00 | 7.67 | 96.26 | 103.93 | 2,237.57 | 160.51 | 543.56 | 39,750.02 | 42,691.66 | 42,795.59 |
| 1991 | 0.00 | 21.13 | 177.25 | 198.38 | 2,236.87 | 237.90 | 699.34 | 39,422.28 | 42,596.39 | 42,794.77 |
| 1990 | 0.00 | 36.70 | 226.41 | 263.11 | 2,236.09 | 323.29 | 965.42 | 39,007.13 | 42,531.93 | 42,795.04 |
| 1989 | 0.00 | 56.29 | 305.94 | 362.23 | 2,236.09 | 376.57 | 1,176.08 | 38,647.58 | 42,436.32 | 42,798.55 |
| 1988 | 4.07 | 295.44 | 494.68 | 794.19 | 2,268.34 | 517.25 | 2,182.94 | 37,035.61 | 42,004.14 | 42,798.33 |
| 1987 | 4.07 | 367.57 | 569.21 | 940.85 | 2,226.30 | 716.70 | 6,003.73 | 32,912.14 | 41,858.87 | 42,799.72 |
| 1986 | 5.62 | 480.17 | 650.56 | 1,136.35 | 2,230.53 | 851.19 | 11,237.47 | 27,342.15 | 41,661.34 | 42,797.69 |
| 1985 | 134.47 | 543.64 | 737.97 | 1,416.08 | 2,242.94 | 976.53 | 11,930.92 | 26,337.97 | 41,488.36 | 42,904.44 |
| 1984 | 147.66 | 637.78 | 789.71 | 1,575.15 | 2,243.64 | 1,025.46 | 13,235.32 | 24,824.87 | 41,329.29 | 42,904.44 |
| 1983 | 233.53 | 1,050.56 | 629.21 | 1,913.30 | 2,197.80 | 1,044.77 | 15,576.05 | 22,165.10 | 40,983.72 | 42,897.02 |
| 1982 | 320.58 | 1,112.53 | 642.08 | 2,075.19 | 2,257.35 | 1,217.96 | 25,608.50 | 11,785.78 | 40,869.59 | 42,944.78 |
| 1981 | 380.63 | 1,193.03 | 735.66 | 2,309.32 | 2,265.80 | 1,231.47 | 32,039.10 | 5,097.83 | 40,634.20 | 42,943.52 |
| 1980 | 394.09 | 1,024.51 | 828.84 | 2,247.44 | 2,262.94 | 1,417.68 | 30,475.98 | 6,095.96 | 40,252.56 | 42,500.00 |
| 1979 | 409.78 | 1,198.51 | 1,114.33 | 2,722.62 | 2,266.53 | 1,591.02 | 29,787.74 | 6,132.09 | 39,777.38 | 42,500.00 |
| 1978 | 469.89 | 1,394.39 | 1,223.51 | 3,087.79 | 2,266.12 | 1,686.27 | 27,968.78 | 7,491.04 | 39,412.21 | 42,500.00 |
| 1977 | 550.51 | 1,610.75 | 1,431.89 | 3,593.15 | 2,265.92 | 1,731.27 | 26,149.63 | 8,760.03 | 38,906.85 | 42,500.00 |
| 1976 | 676.48 | 1,800.43 | 1,840.74 | 4,317.65 | 2,266.30 | 1,940.05 | 25,257.19 | 8,718.81 | 38,182.35 | 42,500.00 |
| 1975 | 681.62 | 2,164.79 | 2,261.54 | 5,107.95 | 2,263.79 | 2,030.92 | 24,002.26 | 9,095.08 | 37,392.05 | 42,500.00 |
| 1974 | 837.17 | 2,659.71 | 2,730.59 | 6,227.47 | 2,308.17 | 2,093.50 | 22,627.54 | 9,243.32 | 36,272.53 | 42,500.00 |
| 1973 | 912.30 | 3,091.05 | 3,036.19 | 7,039.54 | 2,309.23 | 2,364.00 | 30,787.23 | 35,460.46 | 42,500.00 |
| 1972 | 1,268.70 | 3,545.49 | 3,292.59 | 8,106.78 | 2,303.39 | 2,484.97 | 29,604.86 | 34,393.22 | 42,500.00 |
| 1971 | 1,552.20 | 4,097.72 | 3,862.41 | 9,512.33 | 2,305.13 | 2,780.20 | 27,902.34 | 32,987.67 | 42,500.00 |
| 1970 | 1,634.82 | 5,138.69 | 4,183.11 | 10,956.62 | 2,306.07 | 2,932.42 | 26,304.89 | 31,543.38 | 42,500.00 |
| 1969 | 1,780.73 | 6,299.09 | 4,782.48 | 12,862.30 | 2,302.41 | 3,143.76 | 24,191.53 | 29,637.70 | 42,500.00 |
| 1968 | 2,240.80 | 7,439.10 | 5,215.90 | 14,895.80 | 2,303.30 | 3,109.90 | 22,191.00 | 27,604.20 | 42,500.00 |
| 1967 | 1,062.90 | 8,805.00 | 5,490.20 | 15,358.10 | 2,303.30 | 3,354.20 | 19,984.40 | 25,641.90 | 41,000.00 |
| 1966 | 1,578.90 | 10,292.10 | 5,653.40 | 17,524.40 | 2,305.00 | 3,255.90 |
17,914 70 | 23,475.60 | 41,000.00 |
| 1965 | 2,878.90 | 11,356.30 | 5,580.00 | 19,815.20 | 2,318.50 | 2,893.90 | 15,972.40 | 21,184.80 | 41,000.00 |
| 1964 | 4,680.80 | 12,103.70 | 5,196.70 | 21,981.20 | 2,324.80 | 3,058.90 | 13,635.10 | 19,018.80 | 41,000.00 |
| 1963 | 7,435.10 | 12,031.60 | 4,977.90 | 24,444.60 | 2,347.10 | 3,077.80 | 11,130.50 | 16,555.40 | 41,000.00 |
| 1962 | 11,368.10 | 10,955.40 | 4,340.70 | 26,664.20 | 2,307.30 | 3,113.80 | 8,914.70 | 14,335.80 | 41,000.00 |
| 1961 | 13,790.30 | 10,668.00 | 4,245.30 | 28,703.60 | 2,302.90 | 3,070.60 | 6,922.90 | 12,296.40 | 41,000.00 |
| 1960 | 16,402.40 | 10,032.30 | 4,125.40 | 30,560.10 | 2,263.70 | 3,041.00 | 5,135.20 | 10,439.90 | 41,000.00 |
| 1959 | | | | | | | | | | 41,000.00 |
| 1958 | | | | | | | | | | 41,000.00 |
| 1957 | | |
Mileage status data is not available for years prior to 1960. | | 37,700.00 |
| 1956 | | | | | | | | | | 37,700.00 |
| Pre-1956 | | | | | | | | | | 37,700.00 |
Footnotes:
- A reserve of undesignated mileage was reported in Preliminary Status through 1985; reporting discontinued thereafter.
- No distinction was made between fully complete mileage and mileage with minor work remaining prior to 1974.
- The designation of the first 37,700 miles of Interstate highways was announced by BPR on 8/2/47.
- The Federal-Aid Highway Act of 1956 increased the system's proposed length to 41,000.
- The Federal-Aid Highway Act of 1968 authorized the system's expansion to 42,500 miles.
- Additional mileage (up to 500 miles) was added on 1/2/68 by P.L. 90-238, as amended, for making modifications or revisions as provided by 23 U.S.C. 103(e)(2) at no additional cost. [Howard-Cramer Additions]
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Contact
Richard Weingroff
Office of Infrastructure and Transportation Performance
202-366-4856
E-mail
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