# Nevada Ionwave #608010-26 Addendum 4

Clark County roadway improvements and ponding mitigation

**Posted:** October 13, 2026
**Respond By:** November 10, 2026
**Identifier:** 608010-26 Addendum 4
**NAICS:** 237310, 237990

Clark County is seeking bids for roadway improvements and ponding mitigation in Las Vegas, Nevada.
- **Government buyer:** Clark County, Nevada; no sub-agency or office is identified.
- **Work requested:** Improve Sim Street from Marley Way to Warm Springs Road and mitigate ponding along the south side of Cottonwood Avenue from Swapp Drive to Heyer Street.
  - Remove and replace asphalt pavement; provide and install traffic signs and related appurtenances within the existing right-of-way.
  - Re-grade the existing swale and shape the earthen channel to its designed width, side slopes, and longitudinal slope.
  - Remove and replace storm drain pipe at residential driveways with a 4 ft × 2 ft reinforced concrete box.
- **Signage:** Replace W1-1R and W1-1L signs and install an R2-1 sign in accordance with standard drawings and MUTCD.
- **Notable specifications:** Drainage excavation is measured in square yards; riprap thickness is 12 inches.
- **OEMs and vendors:** No manufacturers, OEMs, or vendors are named. No product quantities or part numbers are specified.

### Description

Clark County invites bids for roadway improvements on Sim Street from Marley Way to Warm Springs Road, and ponding mitigation along Cottonwood Avenue from Swapp Drive to Heyer Street. Work includes removing and replacing asphalt pavement, signage, traffic signing, and related appurtenances within the existing right-of-way. Ponding mitigation includes re-grading the existing swale and replacing storm drain pipe on residential driveways with 4 ft × 2 ft reinforced concrete box. The stated bid deadline is November 10, 2026, at 2:15 PM PT.

[View original listing](https://nevada.ionwave.net/PublicDetail.aspx?bidID=20814&SourceType=1)