Deeper Dive into Northpark Expansion, Drainage Plans

On 7/27/23, I interviewed Ralph De Leon, Northpark project coordinator for the Lake Houston Redevelopment Authority (TIRZ 10) and Kevin Perkins, a project manager for HNTB, one of the contractors on the job. The discussion covered both the eastern and western phases of the project from Woodland Hills Drive on the east to US59 and beyond on the west.

Since Tuesday, the contractors have made visible progress. Let’s cover that first. Then I’ll cover some surprising facts I learned about the project, including flood-mitigation plans; why the project has taken so long; how it will expand to 10 lanes near the railroad and Loop 494; parts of the project that will be elevated; bridge reconstruction; Atlas-14 conflicts; and more.

Box Culverts Arrive

By mid-day today, contractors had box culverts stacked several blocks in the median between Russell-Palmer Road and Flowers of Kingwood. They also had three excavators working Thursday, compared to one on Tuesday. And they were cutting concrete in the cross-overs.

Looking west from the diversion ditch (foreground). Only the 66″ round concrete pipe by the first excavator was there on Tuesday.
Looking east down the Northpark Drive median in opposite direction. Those rectangular culverts measure 6’x8′.
Note men cutting concrete in the median between Flowers of Kingwood (upper left) and the fireworks stand (out of frame, lower right).

The 6×8 box culverts stacked in the distance will extend under the cross-over and connect to the round concrete pipe using the junction box stacked in front of the four round pipes. See below.

Box culverts were stacked up to the red rib truck in the background.

The box culverts will convey 35 square feet of stormwater compared to slightly fewer square feet for the round pipe.

That “step-down” as stormwater moves toward the diversion ditch will provide inline detention.

Also note that the existing culverts under the crossovers provide even less conveyance/storage than the new pipe. The old pipes were much smaller and frequently become clogged with weeds and grass due to long maintenance intervals.

According to Perkins, the new pipe/culvert solution offers less friction from end-to-end. The pipes shouldn’t become clogged like the old pipes did because grass and weeds won’t grow in them. Also, their consistent dimensions under the cross-overs should let more water pass through faster.

To make sure water can get into the culverts quickly during heavy rains, contractors will use extra large inlets, similar in size to those used on freeways.

Why Project Has Taken So Long

De Leon and Perkins discussed approval delays at length, mostly related to multiple groups giving input and approvals.

  • The project goes into, out of and back into the City of Houston.
  • It straddles two counties, each with different leadership and regulations.
  • A TIRZ, several MUDs, homeowner associations, commercial associations, KSA and Lone Star College are also involved.
  • Harris County Flood Control District is reviewing all the plans and approvals.
  • TxDoT has final say over design criteria.
  • Funding will come from State, Federal, and local authorities.
  • The Union Pacific (UP) Railroad has had multiple changes in leadership since the project started.
  • Gaining utility easements and rights of way has taken much longer than expected. For instance, Entergy wants 50 months to move a SINGLE transformer, almost half again as long as it will take to build the ENTIRE bridge over 494 and the UP railroad tracks.

Getting all those dominos to line up has challenged everyone involved.

Project Will Expand to 10 Lanes Near Loop 494

Where the western phase of the project crosses Loop 494 and the UP railroad tracks, traffic surveys indicate that 80% of the traffic will go over the bridge. Regardless, TxDoT requires two lanes of feeder road in each direction to handle local traffic not going over the bridge. Six lanes of bridge and four lanes of feeder will require some property acquisition still to be completed. Not all of the expansion will fit over the center ditch.

Pedestrian Underpass

The eastern phase of the project will contain a pedestrian underpass similar to others found throughout Kingwood. Engineers hope to keep water out by making the entrances higher than surrounding areas so water drains away. The tunnel will be 10 feet wide to accommodate special extra-wide wheelchairs for people with curved spines. Ten feet will accommodate two such wheelchairs moving in opposite directions.

Elevated Roadway with Cheek Walls

In certain areas that experience repetitive flooding, especially east of the drainage ditch where Bens Branch cuts under Northpark Drive, the road will be elevated. Feathering out the bed toward the sides would require killing hundreds, if not thousands of trees. So instead, contractors will elevate the road using “cheek walls.” Highway 59 makes extensive use of cheek walls for the same reason – to conserve space and allow trees to grow.

Two 10-Foot Sidewalks to Lone Star College

West of 59, contractors will build two 10-foot sidewalks along Rock Creek south of Northpark. The sidewalks will help cash-starved Lone Star College students ride bicycles to class when weather permits. Katherine Perrson, now retired head of the college, made the request.

Leaving Room for Diversion Ditch Expansion

The City has hired a contractor called NBG Constructors to clean out the diversion ditch under both Northpark Drive bridges and return the channel to its original as-designed capacity. Over the years, sedimentation has constricted the flow as you can see below.

Note accumulated sediment constricting flow under bridge.

Eventually, Harris County will widen the diversion ditch. HCFCD rated it one of the two most important projects in Kingwood. As part of the Northpark Expansion project, both bridges will be rebuilt, but with enough width to accommodate eventual expansion of the ditch.

Meets Harris County Atlas-14 Requirements

When complete, the project will meet Harris County Atlas-14 requirements for 77339 which are more stringent (about 40% higher) than Montgomery County’s. That’s because virtually all of the water associated with this project will drain into Harris county. MoCo standards are lower because Montgomery averages requirements across the entire county. Rainfall drops off with distance from the Gulf.

Detention Basins and 59 Entry

To reduce the chance of flooding near 59, contractors will build two detention basins on either side of Northpark at 59. They will connect with each other underground and also connect with another basin and channel north of Northpark via an 8 foot pipe.

Timetable

All this won’t happen overnight. De Leon is working on updating the timetable and will post it with a new project website that gives Kingwood and Porter residents weekly or bi-weekly updates. More news to follow, including a deeper dive into the drainage analysis and how some water will be diverted around Northpark.

Posted by Bob Rehak on 7/27/23

2158 Days since Hurricane Harvey

Northpark Drive Expansion Begins in Earnest

Note: This story was updated on 7/26/23 to include more information about phasing of the Northpark Drive expansion project.

After what turned out to be a ceremonial groundbreaking on 4/13/23, the Northpark Drive expansion project appears to have started in earnest on 7/25/2023. Northpark is a vital evacuation route for tens of thousands of Kingwood and Porter residents during floods.

Cones and Culvert Line Northpark Center Ditch

Traffic cones line the center ditch between Russell-Palmer and the Kingwood Diversion Ditch.

Looking west toward Russell-Palmer Road

Contractors have also stacked what looks like six-foot reinforced-concrete pipe on the edge of the Northpark Drive ditch where it enters the Kingwood Diversion Ditch.

Looking SE across Northpark from Fireworks Stand parking lot to Flowers of Kingwood.

They have also begun excavating the Northpark center ditch.

Looking E to Kingwood and City Limit (Green sign).

Project Partners

Project partners include:

  • Lake Houston Redevelopment Authority
  • City of Houston District E
  • Montgomery County Precinct 4
  • Texas Dept. of Transportation
  • Harris County Flood Control

Plan Vs. Execution

In general, the project partners plan to widen Northpark by a lane in each direction (toward the middle). But instead of taking land and parking from merchants, the project partners plan to replace the center ditch with culvert then pave over it.

Early plans indicated that the area between US59 and Russell-Palmer would be Phase One and that Russell-Palmer to the Diversion Ditch and eventually beyond Woodland Hills would follow.

However, Ralph Deleon, a TIRZ engineer/project manager indicated that contractors are taking pieces of the phases out of order. Why? Contractors are ready to go. But not all the right-of-way and utility issues have been resolved.

So they’re approaching drainage first and starting at the downstream end – a best practice. In coming days, we should see additional activity on other portions of Northpark Drive. But Deleon emphasized that the public should have two lanes of traffic in both directions at all times.

The Lake Houston Redevelopment Authority (TIRZ 10) website contains a number of videos and construction docs that detail the ultimate vision for the project as well as next steps.

Will Culvert Convey as Much as Ditch?

The first thing that popped into my mind when I looked at the size of the culvert and the size of the ditch was that the culvert could not possibly convey all the water that the ditch used to.

Google Earth shows width of v-shaped ditch is 50 feet. Circular pipe is 6 feet.

Then I read this letter from Harris County Flood Control to the engineering company. It states, “The proposed improvement includes enlarging the proposed storm sewer system to provide inline detention and modeling the restrictors needed to meet allowable outflow requirements for both outfalls.”

The pipes shown above would definitely act as restrictors. I sure hope they don’t back water up into the street.

Having worked near Northpark for 22 years, I’ve seen the ditch overflow on multiple occasions. I’ve seen cars plunge to the bottom, emergency rescues, and stalled vehicles.

Here is the engineering company’s drainage impact analysis. And this presentation provides a project overview for the pre–bid conference for the western portion of the project. It shows a 32-month construction schedule for the western portion alone – even with a six day work week.

More Info to Follow

The TIRZ docs for the eastern portion of the project (Russell-Palmer to Diversion Ditch, Woodland Hills and beyond) are less comprehensive.

I’m meeting with the engineers and contractors tomorrow to learn more. Check back for more news and analysis.

Posted by Bob Rehak on 7/25/2023 and updated on 7/26/23

2156 Days since Hurricane Harvey

Nine Crenshaw Flood-Related Earmark Requests Approved by Various House Committees

U.S. Congressman Dan Crenshaw made nine flood-related earmark requests for 2024. And according to his office, several House of Representative Committees have approved all nine. They include:

  • $1.75M – Taylor Gully Flood Mitigation Project
  • $1.75M – Goose Creek Channel Conveyance Improvements
  • $3.6M – Highlands, Huffman & Crosby Roadway Reconstruction and Drainage Improvements project
  • $1.83 – San Jacinto River Wastewater System Replacement
  • $4M – Kingwood Diversion Channel/Walnut Lane Bridge
  • $1.12M – FM1488 Area Street Rehabilitation and Drainage Improvement Project 
  • $3M – Tamina Economic Development Planning Project
  • $7M – Ford Road Improvement Projects
  • $700,000 Montgomery County Bridge Project 

A committee also approved a request by Crenshaw NOT related to flooding – $1.65M for the Montgomery County Active Shooter Defense Training Facility. That means all 10 of Representative Crenshaw’s 2024 requests received funding, although not all received the full amount requested.

Project Descriptions

For descriptions of all 10 earmarks requested by Crenshaw, see below.

1. Taylor Gully Flood Mitigation Project

Recipient: Harris County Flood Control District

Requested: $8 million 

Committee Approved: $1.75 million. See Interior List.

Purpose: To reduce flood risk in the Kingwood area.  This area experienced widespread flooding from recent storm events, including Hurricane Harvey and Tropical Storm Imelda.  This project will create a detention basin and improve stormwater conveyance to minimize flood risks. Engineering studies show that completion of this project will result in substantial reductions in flooding along Taylor Gully.  The studies show that this project will remove the 100-year floodplain from more than 276 structures and 115 acres of flood area.

2. Goose Creek Channel Conveyance Improvements and Stormwater Detention Project

Recipient: Harris County Flood Control District

Requested: $8 million

Committee Approved: $1.75 million. See Interior List.

Purpose:  This project is designed to reduce flood risk within the Goose Creek Watershed by creating a detention basin and improving stormwater conveyance. The project is estimated to remove approximately 28 acres of inundated land, up to 77 structures, and 1.44 miles of inundated roadways from the 100-year event. Preventing flooding will avoid the need for more costly recovery efforts after flooding events.

3. Highland / Huffman / Crosby Roadway & Drainage Improvement 

Recipient: Harris County, Texas

Requested: $3.6 million 

Committee approved $3.6 million. See Transportation, and Housing and Urban Development List.

Purpose: Reconstruction of multiple poorly paved roads in subdivisions throughout the Highlands, Crosby, and Huffman areas of northeast Harris County. Existing gravel roads and inadequate drainage will be replaced with asphalt pavement, driveway culverts, and roadside ditches that will greatly improve residents’ quality of life. The projects will also improve accessibility for law enforcement and emergency services, reduce flood risk, and bring the local infrastructure to a standard acceptable for long-term County maintenance. 

4. San Jacinto River Wastewater System Replacement Project

Recipient: Army Corps of Engineers

Requested: $1.8 million

Committee Approved: $1.83 million. See Energy and Water List.

Purpose: To increase the reliability of the San Jacinto River Authority Woodlands Division wastewater conveyance system and repair damage from recent storms. List stations were damaged by flooding during Hurricane Harvey and have yet to be repaired. Both on-site lift stations, the control building, and the emergency generator were flooded and need to be replaced. This request would fund the demolition of the existing structure and build new systems. 

5. Kingwood Diversion Channel – Walnut Lane Bridge Project

Recipient: City of Houston

Requested: $4 million 

Committee Approved: $4 million. See Homeland Security List.

Purpose: The project includes the widening and reconstruction of Walnut Lane Bridge in Kingwood. This bridge, in its current configuration, will restrict flood flows unless widened to accommodate the future expansion of the Kingwood Diversion Channel currently being designed by the Harris County Flood Control District. The purpose of the overall project is to route drainage from Montgomery County to Lake Houston and reduce flood damage to residents of Kingwood along Bens Branch. The funding is needed to construct improvements needed to facilitate the expansion of the Kingwood Diversion Ditch and rebuild the Walnut Lane Bridge.

6. FM1488 Area Street Rehabilitation and Drainage Improvement Project 

Recipient: City of Conroe

Requested: $1.12 million

Committee Approved: $1.12 million. See Transportation, and Housing and Urban Develop List.

Purpose: The project will fund roadway resurfacing, drainage improvements, and storm sewer upgrades of roadways connecting to FM1488 near IH-45 (southern part of Conroe). The City of Conroe has experienced severe weather and rainfall which causes considerable wear and tear on the roads and drainage network. The project will benefit residential areas, including the Arella Forrest at Woodland Senior Living Center and Stillwater neighborhood. It will also improve access to the WG Jones State Forest, which serves a community located in a Historically Disadvantaged Community Tract. 

7. Tamina Economic Development Planning Project

Recipient: Montgomery County

Requested: $3 million 

Committee Approved: $3 million. See Transportation and Housing and Urban Development List.

Purpose: The Tamina area is not served by modern street and stormwater management systems. The streets are in disrepair and the area drains very poorly, creating an elevated risk of flooding. The first phase of economic development planning, which this request would support, is to complete detailed engineering and environmental studies, provide new driveways and culverts, and re-grade all of the ditches to allow them to drain. 

8. Ford Road Improvement Project 

Recipient: Montgomery County 

Requested: $12 million 

Committee Approved: $7 million. See Transportation List.

Purpose: Support Ford Road improvements from US 59 in Montgomery County to the Harris County line. The current road is undersized and serves as one of only three evacuation routes for the Kingwood area. All three routes have drainage issues and Ford Road is only a two-lane road. The proposed project would make Ford Road a four-lane road, improve local drainage, and improve driver and pedestrian safety in the corridor.

9. Montgomery County Bridge Project 

Recipient: Montgomery County 

Requested: $900,000

Committee Approved: $700,000. See Transportation List.

Purpose: Provide funding for five rural wooden bridges in Montgomery County that are past their design life and need to be replaced. The bridges were not built to current criteria and increase the risk of flooding by backing up water during large storms. One bridge serves as the only way in and out of a subdivision presenting a safety hazard. The funding request is for engineering, surveying, and permitting services to develop construction plans to replace five bridges.

10. Active Shooter Defense Training Facility

Recipient: Montgomery County 

Requested: $2.3 million 

Committee Approved: $1.65 million. See Commerce, Justice, Science List.

Purpose: Purpose: To assist with the operations of our regional active shooter rapid response training facility by purchasing training supplies/aids, equiping graduates with medical response supplies, and ballistic equipment for actual threats. To date, graduates include 1,600 law enforcement personnel, fire and EMS first responders. 

Next Steps

Being approved by a committee doesn’t mean the Crenshaw earmarks are “done deals” yet. The full House of Representatives and Senate must still approve them. And then the President must sign the Appropriations bill into law. So, things could change between now and the end of the year. Final amounts could vary. More news to follow on the Crenshaw earmarks.

Posted by Bob Rehak on 7/24/23

2155 Days since Hurricane Harvey