# Austin Afo #IFB 6100 CLMC1176

Williamson Creek Tributary 4 Channel Stabilization and Utility Improvements – City of Austin

**Posted:** September 28, 2026
**Respond By:** October 29, 2026
**Identifier:** IFB 6100 CLMC1176
**NAICS:** 237110, 237990, 237310

This opportunity is for the stabilization and utility improvement of Williamson Creek Tributary 4 in Austin, TX, managed by the City of Austin Department of Public Works and Watershed Protection Department.
- **Government Buyer:**
  - City of Austin Department of Public Works
  - City of Austin Watershed Protection Department
- **OEMs and Vendors:**
  - No specific OEMs or manufacturers are named; products must meet ASTM and City of Austin standards. Native American Seed Company is referenced for native grass seed mix or approved equal.
- **Products/Services Requested:**
  - Channel stabilization materials: dry stack limestone block walls, rock riprap (Class III & V), vegetated soil-rock riprap, soil retention blankets
  - Utility improvements: 6", 8", 12" PVC wastewater pipes (ASTM D3034 SDR-26, ASTM D2241 SDR-26, ASTM C-900 DR-25), reinforced concrete pipe (30"), steel encasement pipe (16" & 24"), precast watertight wastewater manholes (48", 60", 72" diameters)
  - Erosion control: native seeding (shade-friendly grass mix), grass sodding, mulch socks, protective fencing (chain link, wood, plastic, Type C), safety fencing (orange)
  - Site restoration: concrete/asphalt restoration, curb and sidewalk restoration, tree planting (Cedar Elm, Pecan, American Sycamore), live stakes (Black Willow, Sycamore, Dogwood), irrigation system, extended tree maintenance
  - Traffic and safety: barricades, signs, traffic handling devices, pavement markings, flexible delineator posts, traffic control devices
  - Other: clearing and grubbing, excavation, borrow/topsoil, headwalls, jacking/boring pipe, trench safety systems, project mobilization
- **Unique/Notable Requirements:**
  - Compliance with City of Austin MBE/WBE Procurement Program and wage rates
  - Environmental protection and mitigation measures
  - Licensed plumbers required for wastewater service lateral installations
  - Detailed traffic control and phased construction plans
  - Work within 100-year floodplain and critical water quality zones
  - Arborist services and tree protection
  - Geotechnical investigations required
- **Estimated Contract Value:**
  - Approximately $3.7 million

### Description

This solicitation is for the Williamson Creek Tributary 4 Channel Stabilization project, which addresses severe erosion impacting multiple single-family and commercial properties. The project scope includes armoring stream banks, restoring stable channel geometry, and rehabilitating the riparian ecosystem along the project reach. Additionally, utilities affected by channel degradation will be relocated or protected, including replacement, relocation, and abandonment of wastewater mains at two specified locations. The project aims to stabilize the channel and improve environmental conditions in the affected area.

[View original listing](https://financeonline.austintexas.gov/afo/account_services/solicitation/solicitation_details.cfm?sid=144592)