Benton County: County Ditch 9 restored, contractor work under budget; staff recommends final payment

Engineers and county staff told the Benton County Ditch Authority on May 2 that repairs to County Ditch 9 have been completed and verified, and staff recommended final payment to the contractor.

The county’s presentation summarized a field reestablishment survey of the ditch’s approximately 5.5 miles, sediment probing to locate the original channel bottom, clearing and excavation work, culvert replacements and an assessment of wetland impacts. "A Houston Engineering Field Survey Crew did go into the ditch all 5.5 miles of it on CD9," the presenter said, describing channel-bottom elevation surveys and cross sections used to reestablish the original channel profile.

The engineers found variable sediment accumulation, with depths ranging from about a half-foot to two or more feet in places, and localized obstructions such as tree remnants in the main trunk that reduced flow efficiency. The presentation said clearing removed about seven acres of trees in preparation for open-channel excavation and that three culverts were recommended for replacement because of insufficient capacity or improper elevation relative to the original channel bottom.

Why it matters: the work restores drainage capacity that affects farmland and road crossings, and the county must reconcile construction costs with wetland regulations and the ditch-assessment process.

County staff provided detailed cost figures. The repair report estimated a total construction cost of about $440,000 for open-channel excavation, spoil management and related clearing; adding contingency, engineering, administrative and legal fees produced an initial estimate of about $636,000. Bids returned lower than that estimate; the apparently lowest qualified bidder, identified in the presentation as "Home In Construction," had a bid of $297,000. The presenters said the combined, final outlay for redetermination of benefits, record reestablishment, repair, construction and wetland mitigation came to approximately $496,000—below the earlier repair estimate.

The survey and regulatory review identified a single, small wetland impact near the upstream transition from County Ditch 9 to County Ditch 14. The presenters reported that the impact was 0.06 acre and that they worked with Wetland Conservation Act staff on appropriate mitigation.

On the construction contract, staff said the county had verified the contractor met the contract requirements, including verified channel-bottom excavation depths, and recommended that a final payment of $16,606 be made to the contractor. The transcript records staff’s recommendation but does not record a formal motion, vote tally or explicit approval on that payment.

Quotations in context: the presenter explained the repair/exemption distinction, saying, "There is some exemptions that apply if your work on a drainage system falls within the definition of a repair. So if you can document that you're doing a repair, you're not deepening, widening, modifying the system compared to what it was originally constructed as, you get exemptions that you can take advantage of, specific to wetland regulations." Later on project costs the presenter summarized, "going back to both the redetermination of benefits, record reestablishment and repair, and construction and wetland credit cost, the total was 496,000. So a ways below our projected cost within the repair report." Those statements were given by the project presenter during the engineers’ summary.

Background and next steps: county staff noted the contract work is complete as to County Ditch 9 and that the Wetland Conservation Act mitigation for the 0.06-acre impact had been addressed. The Ditch Authority opened the matter to public comment during the same meeting; public comments and broader questions about assessments and notification were recorded (see separate article). The transcript does not include a recorded roll-call vote or formal approval of the recommended final payment during the portion provided.

Less critical details: presenters showed before-and-after photographs of clearing and excavation, described installations of culverts and noted some unexpected field conditions (older bridge abutments found near a private driveway crossing). The presentation credited the field survey and probing for locating original channel bottoms and for informing culvert elevation decisions.

Ending note: staff recommended the contract be closed with the final payment, but the transcript does not show a formal vote on that recommendation. Questions from the public and additional follow-up about assessment notices and future maintenance were raised at the hearing.