Top Interior other heavy and civil engineering construction contractors
In the 12 months ending Oct 5, 2026, the Department of the Interior obligated $494.3M in net prime contract dollars under NAICS 237990, down 39.8% from $820.6M in the preceding 12 months. 123 prime contractors received positive obligations, and 14 of them accounted for 80% of that spend.
Prime contracts funded by the Department of the Interior. Latest 12 months: Oct 6, 2025 to Oct 5, 2026. Source: USAspending.gov.
Obligations by fiscal year
Net prime contract obligations by federal fiscal year (October to September).
Top Interior contractors for NAICS 237990
Ranked by positive obligations in the latest 12 months. Share is of all positive obligations in this market.
| # | Contractor | Latest 12 mo | Prior 12 mo | Share | Rank change |
|---|---|---|---|---|---|
| 1 | NW Construction, Inc | $126.7M | $225.9M | 24.8% | — |
| 2 | Kiewit Infrastructure West Co. | $103.9M | $217.2M | 20.3% | — |
| 3 | Stone & Lime Imports, Inc | $49.9M | $5.5M | 9.8% | ▲ 17 |
| 4 | Mcmillen, Inc. | $28.1M | $0 | 5.5% | New |
| 5 | SNC Tallimat, LLC | $23.0M | $13.2M | 4.5% | ▲ 4 |
| 6 | Tehama Technical Services, LLC | $15.9M | $0 | 3.1% | New |
| 7 | Randy Kinder Excavating Inc | $10.5M | $0 | 2.1% | New |
| 8 | Dofine Sprinkler Rebuilders Inc | $9.3M | $670K | 1.8% | ▲ 43 |
| 9 | Burke Electric, L.L.C. | $8.9M | $0 | 1.7% | New |
| 10 | Pipkin Inc. | $7.5M | $886K | 1.5% | ▲ 33 |
| 11 | Palouse Power LLC | $7.4M | $0 | 1.5% | New |
| 12 | Garco Construction, Inc. | $6.2M | $21.7M | 1.2% | ▼ 8 |
| 13 | Togiak Logistics Services, LLC | $6.2M | $0 | 1.2% | New |
| 14 | Unico Mechanical Corp. | $5.4M | $6.5M | 1.1% | ▲ 4 |
| 15 | Coastal Construction Group, LLC | $5.3M | $15.5M | 1.0% | ▼ 8 |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- Stone & Lime Imports, Inc$5.5M → $49.9M (+$44.3M) · now #3
- Mcmillen, Inc.$0 → $28.1M (+$28.1M) · now #4
- Tehama Technical Services, LLC$0 → $15.9M (+$15.9M) · now #6
Largest declines
- Kiewit Infrastructure West Co.$217.2M → $103.9M (−$113.3M) · now #2
- Ames Federal Contracting Group LLC$112.1M → $3.0M (−$109.1M) · now #24
- NW Construction, Inc$225.9M → $126.7M (−$99.1M) · now #1
New to this market
54 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| Tehama Technical Services, LLC | Aug 27, 2026 | $15.9M |
| Randy Kinder Excavating Inc | Mar 23, 2026 | $10.5M |
| Burke Electric, L.L.C. | Mar 5, 2026 | $8.9M |
| Palouse Power LLC | Mar 9, 2026 | $7.4M |
| Togiak Logistics Services, LLC | Sep 11, 2026 | $6.2M |
| Doyon Technical Services, LLC | Sep 24, 2026 | $4.7M |
| Capex Construction LLC | Jan 7, 2026 | $4.2M |
| Robins Construction LLC | Jan 23, 2026 | $3.8M |
Where the money comes from
Funding sub-agencies within the Department of the Interior, latest 12 months. The funding organization can differ from the office that runs the requirement.
| Funding sub-agency | Latest 12 mo | Prior 12 mo | Change |
|---|---|---|---|
| National Park Service | $225.0M | $310.6M | Down $85.6M (27.6%) |
| Bureau of Reclamation | $192.2M | $454.0M | Down $261.7M (57.7%) |
| Bureau of Indian Affairs and Bureau of Indian Education | $37.4M | $1.6M | Up $35.7M (2165.4%) |
| Bureau of Land Management | $21.8M | $38.0M | Down $16.3M (42.8%) |
| U.S. Fish and Wildlife Service | $17.6M | $16.2M | Up $1.4M (8.9%) |
| U.S. Geological Survey | $243K | $74K | Up $169K (228.6%) |
Potential recompetes
Large awards in this market whose current period of performance ends in the next 18 months. Treat these as research leads: options, extensions, and follow-on vehicles often change the timing.
| Award | Incumbent | Obligated | Current end |
|---|---|---|---|
| 140P2024C0057 | Jrcruz Corp. GATE 318738 - DESIGN BUILD - REHAB WATER, WASTEWATER, AND STORMWATER UTILITY SYSTEMS AT FORT WADSWORTH | $21.5M | Dec 20, 2026 |
| 140R2022C0007 | NW Construction, Inc BF SISK SAFETY OF DAMS (SOD) MODIFICATIONS, PHASE I, THIS PHASE INCLUDES CONSTRUCTION OF SHEAR KEYS, STABILITY BERMS, AND SPILLWAY MODIFICATION. THE PROJECT WILL ADDRESS ISSUES… | $139.3M | Dec 31, 2026 |
| 140A1623C0014 | Komada LLC OGLALA DAM REMEDIATION PROJECT. SEE SECTION J FOR LIST OF ATTACHMENTS. | $67.0M | Dec 31, 2026 |
| 140P2023C0037 | Cianbro Corporation NAMA 318722 REHABILITATE SEAWALLS AND SHORELINE DESIGN-BUILD SOLICITATION 140P2023R0020 | $112.8M | Feb 1, 2027 |
| 140P2025C0020 | SNC Tallimat, LLC EXTEND PUBLIC LAUNCH RAMP AT HEMENWAY HARBOR - 332529, LAKE MEAD NATIONAL RECREATION AREA, BOULDER CITY, NEVADA | $22.8M | May 16, 2027 |
| 140R1023C0008 | Garco Construction, Inc. CLE ELUM DAM FISH PASSAGE FACILITY ADULT FACILITY, YAKIMA RIVER BASIN WATER ENHANCEMENT PROJECT, WASHINGTON | $61.2M | Jun 1, 2027 |
| 140P2024C0088 | Coastal Construction Group, LLC SLBE 318729 - REHABILITATION OF MANITOU ISLANDS, AT SLEEPING BEAR DUNES NATIONAL LAKESHORE, MI | $48.8M | Jul 15, 2027 |
| 140R2025C0011 | Forgen LLC BATTLE CREEK - SOUTH DIVERSION DAM AND CANAL REMOVAL | $18.5M | Aug 26, 2027 |
| 140P2026C0012 | Stone & Lime Imports, Inc CASA 324271, CASTILLO DE SAN MARCOS NATIONAL MONUMENT, REPAIR AND RAISE SEAWALL | $38.0M | Jan 28, 2028 |
| 140P2023C0121 | Stone & Lime Imports, Inc DRTO 244370/244372 - REPAIRS TO FORT JEFFERSON COUNTERSCARP & MAINTENANCE DREDGING AT DRY TORTUGAS NATIONAL PARK | $26.3M | Jan 31, 2028 |
Common questions
Who are the top Interior contractors for NAICS 237990?
In the latest 12 months, NW Construction, Inc ($126.7M), Kiewit Infrastructure West Co. ($103.9M), Stone & Lime Imports, Inc ($49.9M) received the most Interior obligations for other heavy and civil engineering construction.
How concentrated is this market?
The eight largest primes held 71.9% of positive obligations, and NW Construction, Inc alone held 24.8%. 54 contractors won their first obligations in this market during the latest 12 months.
Are any large Interior NAICS 237990 contracts ending soon?
10 of the largest awards in this market reach their current end date in the next 18 months. The first is 140P2024C0057 (Jrcruz Corp., $21.5M obligated), ending Dec 20, 2026. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
Related markets
NAICS 237990 across all agencies
DoD · NAICS 237990
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$206.7MDHS · NAICS 237990
$94.5MUSDA · NAICS 237990
$43.7MState Department · NAICS 237990
$5.2MFigures are net obligations on prime contracts (award types A–D) from USAspending.gov, grouped by funding agency and the NAICS code on each award. Net obligations include deobligations and corrections, so they can differ from positive-obligation totals. See methodology.
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