NAICS directory · Heavy and Civil Engineering Construction (237)
NAICS 237990 — Other Heavy and Civil Engineering Construction
Heavy and civil work not classified elsewhere — dams, levees, marine construction, dredging, channels, and other site-scale civil projects.
What gets solicited under 237990
- Dredging and channel maintenance
- Levee, floodwall, and flood-control structures
- Pier, wharf, and bulkhead marine work
- Dam and spillway rehabilitation
- SBA size standard
- $45.0M average annual receipts (13 CFR § 121.201, verified June 2026)Exception — Dredging and Surface Cleanup Activities: $37.0M.
- Why the standard matters
- Average annual receipts under $45.0M let you compete for 237990 set-asides — including 8(a), HUBZone, SDVOSB, and WOSB solicitations when your firm holds the certification. Primes bidding 237990 work also use that threshold to fill small-business subcontracting goals.
- Open in our feed
- 170 open federal opportunities under 237990 right now — pulled from SAM.gov, updated hourly.
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