PSC Z1LB: Maintenance of Highways/Roads/Streets/Bridges/Railways
Z1LB is the product and service code (PSC) federal agencies use for maintenance of highways/roads/streets/bridges/railways, in the maint, alter, repair buildings group. Here are the contracts open under it now, the NAICS codes it pairs with, and who buys and wins this work.
- Open contracts now
- 9
- Spending, FY2026
- $243.2 million
- Share to small businesses
- 90%
Open contracts with PSC Z1LB, due soonest
- RDO_TIOGA BRIDGE REHABILITATION
Due in 5 daysOct 15, 2026
- Solicitation is Restricted to the Current Region 3, Zone 5 FERM BPA Holders - USDA Forest Service
Due in 5 daysOct 15, 2026
- RDO_TIOGA BRIDGE REHABILITATION
✦ The Bureau of Land Management (BLM), Roseburg District in Oregon wants a contractor to reseal and treat the timber parts of the Tioga Pedestrian Bridge over the North Umpqua River.
Due in 6 daysOct 16, 2026
- BRCA 310427 Southbound Shuttle Stop
✦ The National Park Service (Denver Service Center) wants a contractor to build shuttle stop improvements along Bryce Canyon Road at Bryce Canyon National Park, Utah, including a…
Due in 9 daysOct 19, 2026
- Bonners Ferry Road Grading
✦ The U.S. Forest Service wants a contractor for road grading, road maintenance and minor road repair on roads in the Idaho Panhandle National Forests, Bonners Ferry Ranger…
Due in 10 daysOct 20, 2026
- Opportunity Available to NM FERM BPA Zone 1 Contractors ONLY with the USDA Forest Service
Due in 12 daysOct 22, 2026
Where Z1LB sits in the PSC Manual
- Category: Service
- Group Z: Maint, Repair, Alter Real Property
- Group Z1: Maint, Alter, Repair Buildings
- Code Z1LB: Maintenance of Highways/Roads/Streets/Bridges/Railways
NAICS codes used with PSC Z1LB
The NAICS code on a contract sets the size standard for who counts as small. These are the codes agencies pair with Z1LB most often:
| NAICS | Industry | Spent, last 3 years |
|---|---|---|
| 237310 | Highway, Street, and Bridge Construction | $357.2 million |
| 237990 | Other Heavy and Civil Engineering Construction | $156.4 million |
| 236220 | Commercial and Institutional Building Construction | $111.6 million |
| 238990 | All Other Specialty Trade Contractors | $55 million |
| 561210 | Facilities Support Services | $33.5 million |
| 488210 | Support Activities for Rail Transportation | $18.3 million |
Who buys under PSC Z1LB
Agencies with the most contract dollars under Z1LB over the last three fiscal years, per USAspending.gov:
| Agency | Obligated |
|---|---|
| Forest Service | $232.1 million |
| Department of the Army | $149.4 million |
| U.S. Customs and Border Protection | $130.6 million |
| Department of the Navy | $85.6 million |
| National Park Service | $65.7 million |
| Department of the Air Force | $31.7 million |
| Bureau of Land Management | $13.8 million |
| Public Buildings Service | $11 million |
On open notices right now, the most Z1LB work comes from Department of the Interior and Department of Agriculture.
Federal spending under PSC Z1LB by year
| Fiscal year | Contract obligations |
|---|---|
| FY2024 | $262.5 million |
| FY2025 | $252.7 million |
| FY2026 | $243.2 million |
| FY2027 (so far) | $-207,265 |
Who wins PSC Z1LB contracts
| Company | Obligated, last 3 years |
|---|---|
| Mckenzie Construction & Site Development LLC | $43.9 million |
| Tactical Infrastructure Maintenance Solutions LLC | $41.3 million |
| Koman Construction, LLC | $40.2 million |
| Kekolu-Rio Vista Joint Venture, LLC | $27 million |
| Columbus Barricades, Inc | $21.9 million |
| FDT Water Infrastructure, LLC | $20.3 million |
| Union Paving & Construction Co | $17.2 million |
| Civil Works Contracting LLC | $16.6 million |
| Rba Engineering International, PLLC | $16.2 million |
| DMS Contracting Inc | $15.3 million |
Related PSC codes
- Z111 Maint – Rep – Alt/Office BLDGS
- Z112 Maint – Rep – Alt/Conf Space & Fac
- Z119 Maint – Rep – Alt/Other Admin BLDGS
- Z121 Maint – Rep – Alt/Air Traffic Towers
- Z122 Maint – Rep – Alt/Air Traffic TNG Fac
- Z123 Maint – Rep – Alt/Radar & Nav Fac
- Z124 Maint – Rep – Alt/Airport Runways
- Z125 Maint – Rep – Alt/Airport Terminals
- Z126 Maint – Rep – Alt/Missile Systems Fac
- Z127 Maint – Rep – Alt/Elct & Comm Sys Fac
Frequently asked questions
What is PSC Z1LB?
Z1LB is the service code in the federal Product and Service Code (PSC) Manual for maintenance of highways/roads/streets/bridges/railways, under Z (Maint, Repair, Alter Real Property) and Z1 (Maint, Alter, Repair Buildings). Agencies put a PSC on every contract to record what they bought.
What is the difference between a PSC and a NAICS code?
A PSC describes what the government is buying. A NAICS code describes the industry of the business doing the work, and it sets the SBA size standard for small business set-asides. Every contract notice has both.
Which NAICS code goes with PSC Z1LB?
Most federal contract dollars under PSC Z1LB go with NAICS 237310 (Highway, Street, and Bridge Construction), according to USAspending.gov. The contracting officer picks the NAICS code for each solicitation, so check the notice.
How do I find contracts that use PSC Z1LB?
Contract opportunities are posted on SAM.gov with their PSC and NAICS codes. 9 open notices use PSC Z1LB right now. FedReady can match new ones to your business and email you, free.