America’s Most Expensive Highway Projects
Here’s our new, updated list of the most expensive highway projects in the US. We rank projects based on their cost per mile.
Based on our current analysis it looks like the two Portland area projects are the #1 and #3 most expensive highway projects (per mile) in the nation. The 5-mile long Interstate Bridge Replacement (IBR) clocks in at about $3 billion/mile and the 1.5 mile Rose Quarter at about $2.3 billion/mile. (This chart and map show the most expensive project in the top ten states; full data for the remaining states is shown at the end of this commentary).
This list helps show which places are pursuing the most expensive projects, and helps put myopic cost estimates in their proper context. ODOT is famous for downplaying or denying culpability for cost-overruns and forgetting or disappearing their original cost estimates hide the scale of this problem. It’s hard for ordinary citizens, and even legislators, to put these numbers in perspective. But here’s something that should help: We can now show that these two large ODOT highway projects are now among the most expensive highway projects in the country.
Portland: Home of the most expensive freeway projects in the nation
Shown below is a map of the nation’s ten most expensive highway projects, calculated on a per mile basis. All of these cost at least $500 million per mile, according to current estimates. There’s a good case to be made that the Rose Quarter and its nearby boondoggle companion–the Interstate Bridge Project–are, mile-for-mile–now the two of the three most expensive highway projects in the nation.
America’s Ten Most Expensive Highway Projects (Per Mile, 2026).

The recently announced price-tag for rebuilding central portion of the Brooklyn-Queens Expressway (itself a classic Robert Moses highway scar) is $4 billion for a one and one-half mile section of roadway, or about $2.66 billion per centerline mile. This just exceeds the cost of the Rose Quarter project, which now is pushed down to third most expensive. (Portland area projects highlighted in red).
Top 10 Most Expensive U.S. Highway Projects by Cost per Mile
Centerline cost per mile ($ Millions).
$3,000M / mi
$2,667M / mi
$2,333M / mi
$1,333M / mi
$1,321M / mi
$1,250M / mi
$564M / mi
$523M / mi
$500M / mi
$486M / mi
These data suggest that Oregon is not simply a representative victim of highway cost inflation, but is actively the worst DOT in the nation in managing highway project costs. That conclusion is also consistent with data on construction costs compiled by Yale University’s Zachary Liscow, who found that Oregon’s costs for routine road repairs were about double the national average.
List of most expensive highway projects in the US, by state
| Rank | State | Project | Estimated Cost | Length | Cost per Mile (Centerline) |
|---|---|---|---|---|---|
| 1 | Oregon/Washington | Interstate Bridge Replacement (WA/OR I-5) | $15.0 Billion | ~5.0 mi | $3,000.0M / mi |
| 2 | New York | Brooklyn Queens Expressway Central Project (Brooklyn) | $4.0 Billion | ~1.5 mi | $2,667 M / mi |
| 3 | Oregon | I-5 Rose Quarter Improvement Project | $3.5 Billion | ~1.5 mi | $2,333 M / mi |
| 4 | Massachusetts | Allston I-90 Multimodal Project (Boston) | $2.0 Billion | ~1.5 mi | $1,333.3M / mi |
| 5 | New Jersey | New Jersey Turnpike Hudson County Extension | $10.7 Billion | ~8.1 mi | $1,321.0M / mi |
| 6 | Connecticut | I-84 Hartford Mobility / Replacement Plan | $5.0 Billion | ~4.0 mi | $1,250.0M / mi |
| 7 | Louisiana | I-10 Calcasieu River Bridge Replacement (Lake Charles) | $3.1 Billion | ~5.5 mi | $563.6M / mi |
| 8 | Texas | North Houston Highway Improvement Project (I-45) | $13.0 Billion | ~24.0 mi | $542.0M / mi |
| 9 | California | Highway 37 (Santa Rosa/Vallejo) | $11.0 Billion | ~21.0 mi | $523.0M / mi |
| 10 | Rhode Island | Washington Bridge I-195 Emergency Replacement | $400 Million | ~0.8 mi | $500.0M / mi |
| 11 | Wisconsin | I-94 East-West Corridor (Milwaukee) | $1.7 Billion | ~3.5 mi | $485.7M / mi |
| 12 | Ohio/Kentucky | Brent Spence Bridge Corridor (OH/KY Shared) | $3.6 Billion | ~8.0 mi | $450.0M / mi |
| 13 | Virginia | Hampton Roads Bridge-Tunnel (HRBT) Expansion | $3.9 Billion | ~9.9 mi | $393.9M / mi |
| 14 | Maryland | I-495 & I-270 Capital Beltway Managed Lanes | $1.5 Billion | ~4.0 mi | $375.0M / mi |
| 15 | Alabama | I-10 Mobile River Bridge & Bayway | $3.5 Billion | ~10.0 mi | $350.0M / mi |
| 16 | Georgia | I-285 / GA-400 Interchange & Top End Express Lanes | $4.6 Billion | ~16.0 mi | $287.5M / mi |
| 17 | South Carolina | I-526 Lowcountry Corridor (Charleston) | $4.0 Billion | ~14.0 mi | $285.7M / mi |
| 18 | Nevada | Project Neon / I-15 Trop-LVC Improvement (Las Vegas) | $1.0 Billion | ~3.7 mi | $270.3M / mi |
| 19 | Utah | I-15 Expansion & Bottleneck Fix (Salt Lake County) | $3.7 Billion | ~17.0 mi | $217.6M / mi |
| 20 | Illinois | Tri-State Tollway (I-294) Expansion | $4.0 Billion | ~22.0 mi | $181.8M / mi |
| 21 | Oklahoma | I-44 / I-235 Interchange Expansion (Oklahoma City) | $680 Million | ~4.5 mi | $151.1M / mi |
| 22 | Pennsylvania | Mon-Fayette Expressway (PA Route 43 Extension) | $2.1 Billion | ~14.0 mi | $150.0M / mi |
| 23 | Arkansas | I-30 Crossing Project (Little Rock) | $1.00 Billion | ~7.3 mi | $137.0M / mi |
| 24 | Hawaii | Honolulu Rail/H-1 Corridor Integration | $650 Million | ~5.0 mi | $130.0M / mi |
| 25 | Colorado | Central 70 Project (Denver) | $1.2 Billion | ~10.0 mi | $120.0M / mi |
| 26 | Tennessee | Choice Lanes Program (I-24 / I-65 Nashville Corridor) | $3.0 Billion | ~26.0 mi | $115.4M / mi |
| 27 | Florida | I-4 Ultimate / Beyond the Ultimate Corridor | $2.3 Billion | ~21.0 mi | $109.5M / mi |
| 28 | Iowa | I-80 / I-380 System Interchange (Iowa City) | $387 Million | ~4.0 mi | $96.8M / mi |
| 29 | North Carolina | Complete 540 / NC 540 Triangle Expressway | $2.2 Billion | ~28.0 mi | $78.6M / mi |
| 30 | Michigan | I-75 Modernization (Oakland County) | $1.0 Billion | ~18.0 mi | $55.6M / mi |
| 31 | Delaware | U.S. 301 Toll Road Extension | $636 Million | ~12.5 mi | $50.9M / mi |
| 32 | New Mexico | I-25 / I-40 “Big I” & South Corridor Upgrades | $250 Million | ~5.0 mi | $50.0M / mi |
| 33 | North Dakota | I-94 / I-29 Tri-Level Interchange Rebuild (Fargo) | $95 Million | ~2.0 mi | $47.5M / mi |
| 34 | Idaho | I-86 / I-15 System Interchange Rebuild (Pocatello) | $112 Million | ~2.5 mi | $44.8M / mi |
| 35 | Maine | I-95 / Hampden Bridge & Corridor Rebuild | $85 Million | ~2.0 mi | $42.5M / mi |
| 36 | Minnesota | I-494 Airport to Hwy 169 Corridor | $377 Million | ~9.0 mi | $41.9M / mi |
| 37 | New Hampshire | I-93 Widening (Salem to Manchester) | $800 Million | ~19.8 mi | $40.4M / mi |
| 38 | Mississippi | I-20 / I-55 West Jackson Corridor Improvements | $180 Million | ~4.5 mi | $40.0M / mi |
| 39 | West Virginia | Corridor H (Elkins to West Virginia/Virginia State Line) | $1.20 Billion | ~30.0 mi | $40.0M / mi |
| 40 | Arizona | I-10 Wild Horse Pass Corridor Expansion | $1.0 Billion | ~26.0 mi | $38.5M / mi |
| 41 | South Dakota | I-29 / 85th Street Interchange (Sioux Falls) | $65 Million | ~2.0 mi | $32.5M / mi |
| 42 | Nebraska | US-77 South Lincoln Beltway | $352 Million | ~11.0 mi | $32.0M / mi |
| 43 | Kansas | U.S. 69 Express Lanes (Overland Park Expansion) | $570 Million | ~18.0 mi | $31.7M / mi |
| 44 | Vermont | U.S. Route 2 / I-89 Reconfiguration (Chittenden) | $45 Million | ~1.5 mi | $30.0M / mi |
| 45 | Alaska | Seward Highway Upgrades (MP 75–90 / MP 100–105) | $380 Million | ~20.0 mi | $19.0M / mi |
| 46 | Montana | I-90 Missoula Corridor Reconstruction | $140 Million | ~8.0 mi | $17.5M / mi |
| 47 | Indiana | I-69 Finish Line (Evansville to Indianapolis) | $2.0 Billion | ~142.0 mi | $14.1M / mi |
| 48 | Missouri | Improve I-70 Statewide Program (3-Lane Expansion) | $2.8 Billion | ~200.0 mi | $14.0M / mi |
| 49 | Wyoming | I-80 Elk Mountain / Winter Safety Corridor Upgrades | $85 Million | ~15.0 mi | $5.7M / mi |
Methodology
There’s no single, authoritative list of current and planned highway projects, so as a first step, we enlisted the assistance of Google’s Gemini AI to compile a list of what it found to be the most expensive current highway project in each of the 50 states, ranked by millions of dollars per centerline mile of project length (a rough yardstick of project scale). The usual caveats apply about AI-generated content, but at first glance, the list reflects most of the well-known projects underway around the country.
We’ve also surveyed colleagues from around the nation, and invited anyone to submit information about ongoing or planned projects that belong on this list. (As promised, we’re periodically updating the list as we acquire more accurate information, and we invite readers to offer corrections and amplifications).
Mostly, the department and the task force are in denial about the chief cause of the agency’s financial problems: exploding costs for a handful of megaprojects. (Two of the agency’s current projects, the IBR and the Rose Quarter, are, respectively, the most expensive and third most expensive highway projects per mile in the nation.) Accurately understanding why these projects are so expensive, and why for more than two decades ODOT has failed to come to grips with this problem, is essential to fixing transportation finance in Oregon.

















