UNSPSC 31331615: Monotower substructure

A mono tower substructure is an offshore platform without any workers, which has one leg. Usually comprises a superstructure supported on a single vertical leg.

UNSPSC 31331615 Monotower substructure is a Commodity code that state and local governments are soliciting primarily for bridge construction and infrastructure projects. Recent opportunities show the code tagged to structural work on pedestrian bridges, roadway improvements, and building construction rather than dedicated monotower applications. The City of San Antonio Capital Delivery Department has posted multiple construction RFPs under the code for projects including the Hays Street Bridge Connections & Eastside Area Streets (response due August 25, 2026) and Fire Station #33 Facility Replacement (response due July 30, 2026), both funded through 2022 Bond programs. Sarasota County solicited an IFB for a steel truss pedestrian bridge on Midnight Pass Road (bid due July 20, 2026) that explicitly names prestressed concrete piles and concrete end bents as project elements. The University of Wisconsin-Madison also appears in the recent record with a metals procurement (steel, aluminum, stainless) that may or may not align with this code's nominal scope. Issuing bodies are mixed across municipal capital departments, county governments, and educational institutions, with San Antonio emerging as a repeat buyer of bond-funded infrastructure work.

Activity concentrates in Texas and Florida, with secondary representation in Wisconsin. The most substantive recent opportunities are the San Antonio bridge and fire station projects, both managed through the Capital Delivery Department's CivCastUSA portal with mandatory or optional pre-submittal conferences and July–August response windows. The Sarasota County pedestrian bridge IFB, posted June 17, 2026, represents a more specialized structural application in Florida. The University of Wisconsin metals RFB (posted March 23, 2026, due April 20, 2026) has already closed and appears tangentially related at best to the monotower substructure code designation. Code activity reflects real infrastructure work—roadway improvements, bridge decks, piles, and end bents—though the monotower classification itself does not appear prominently in recent solicitation language.