17 June 2026

Letter to CalTrans in Reply to the Draft Initial Study for the Widening of Carbon Canyon Road at the S-Curves in Chino Hills

 This was just sent in and an auto reply stated that if it was "received prior to June 17th," it would be part of the public record and responded to in the Final Environmental Document for CalTrans' proposed widening of Carbon Canyon Road (State Route 142) at the S-curves in Chino Hills.  It was understood, however, that today was the last day to submit such comments, so we'll see.

The proposed project to “improve” Carbon Canyon Road (State Route 142) by widening it at the S-curves in Chino Hills is couched as an imperative to improve safety because of community concerns. 

It should be noted, though, that those expressions were not based on the idea that large trucks were crossing the centerline and, therefore, the road should be widened to accommodate more of these vehicles.

Rather, community members were reflecting what has been long understood—Carbon Canyon Road was not built to handle any vehicle with more than four axles and this is clearly represented in existing road alignments and widths elsewhere along its length, not just at the S-curves.

This misrepresentation and flawed interpretation is worsened by the claim that the truck ban instituted just two years ago was intended to be temporary and that the cities of Brea and Chino Hills understood this when signing the agreement.

Adding to the problem is the unaccountable lack of reasonable noticing to those in affected areas of the Canyon, but also to those using the state highway.  This bare minimum of informing just 32 households among hundreds near the project area leaves the indelible impression of a deliberate attempt to evade public scrutiny and minimize community input.  For a government agency, funded by our tax dollars and ostensibly tasked with acceptable levels of transparency, to engage in what can only be termed subterfuge, is deeply disappointing and can only lead to further erosion of trust.

While the original Draft Initial Study required public comment by 16 May, despite almost no public notice of a reasonable level, it was only after a considerable outcry that CalTrans decided to hold a sole public meeting, and this by Zoom, on 10 June.  The lack of a face-to-face gathering is suggestive of a clear lack of interest by the agency in fairly and responsibly engaging with its own constituency, a stunningly tone-deaf circumstance that defies reason and sense.

Despite this, nearly 100 residents attended an in-person gathering while many more logged in from elsewhere, including City of Chino Hills staff and officials.  The input provided to CalTrans officials was clear and unambiguous and, after more than two hours, not a single person expressed any support for the proposal.

As already noted, the insistence that it was understood, by the terms of the 2024 agreement, that the truck ban was to be temporary, was not just met with disbelief by residents, but by city elected officials and staff.

Also striking was the curt dismissal by agency personnel that other areas with similar structural constraints, notably the sharp, narrow curves in Sleepy Hollow (I have a direct view of the most problematic of these), were simply irrelevant because of being outside the limits and scope of this project.  The widening of the S-curves to facilitate five-axle or larger truck traffic will, in fact, encourage more use, but, with conditions unchanged elsewhere, as at Sleepy Hollow, the risks become greater.

The Draft Initial Study offers a Proposed Mitigated Negative Declaration, which asserts that there would be no significant effects relative to air quality and greenhouse gas emissions.  One conclusion for this is that “the project will/would not increase capacity,” while it is added that no air quality study is needed.  Yet, if the “operational improvements” are declared to make it easier for trucks with more than four axles to negotiate the S-curves, is the position by the agency that this won’t be an encouragement for more trucks to use this route?  Isn’t there a distinction to be made between “capacity” and “use”?  The Study also avers that because of “improving operation,” this means that “as such, long-term operations would not result in impacts to air-quality.”  These conclusions look to be based purely on the agency’s internal review, but shouldn’t there be an opportunity for an independent, third-party review of these issues?  It should be added that massive residential construction, as well as commercial and industrial development, in south Chino and south Ontario, will undoubtedly add many more vehicles, cars and trucks, to SR-142.  Has a traffic study accounted for this?

Under “Land Use and Planning,” it is remarked that SR-142 is a “main connector between Orange County and Chino Hills” and “an alternative” to state routes 57, 60 and 91, but there is no acknowledgment of which kind of vehicles are and should be so connected and how much of an alternative Carbon Canyon Road is, given its inherently limited capacity, especially compared to the multi-lane freeways designed to accommodate and handle much larger vehicles.  Further, this section talks about “residents” of four Chino Hills neighborhoods (this would need reworking, as there are more than four and “Litel/Ayala” and “Chino Hills Estates” are, to my understanding, not actual neighborhoods in the area), but clearly the vast majority of users of the highway are not locals and, as noted above, the number of commuters will increase dramatically in coming years.

In the “Noise” section, this, too, is dismissed because of the faulty assumption that “capacity” is equal to “use” and that there would be no increase of truck traffic, with noisier engines and brakes than most other vehicles.

With “Public Services,” the criteria regarding police and fire protection is that there would be no “acquired or displaced” stations or no “affect [on] the level of service,” but, again, this appears to be a presumption that there would be no demonstrable increased use.

Again, under “Transportation,” the claim is repeated that, because the proposed project “does not involve any capacity increasing elements,” but is merely providing “operational improvements to accommodate freight trucks,” a VMT (Vehicle Miles Traveled) analysis is not required.  As to the assertion that widening the curves will enhance safety and there is no impact whatsoever with respect to hazards due to “incompatible uses,” it should be noted that doing so will actually increase speeds and there is already a long history of accidents in this section, involving damage to personal property, utility poles, as well as injury and death, which could be viewed as “incompatible uses” and are obvious detriments to safety.

To sum up, this Draft Initial Study appears to be incomplete and insufficient, lacking in a deep, detailed analysis of traffic and pollution and questionable in its lack of distinction between capacity and use.  The almost total lack of public engagement and the half-hearted attempt, late in the process, to hold a Zoom meeting, which built barriers between the agency and its constituents, also is highly problematic.  Lastly, the misinterpretation of community concerns about trucks crossing the centerline and the claims about the understanding of the truck ban as temporary and subject to rescinding regardless of the outcome of this proposal are just implausible.

You have heard clearly and unequivocally from the City of Chino Hills, the Chino Valley Fire District, San Bernardino County Fourth District Supervisor Curt Hagman and 32nd District State Senator Kelly Seyarto.  You have also heard resoundingly from constituents who expressed unanimity at the meeting and, presumably, have done so, or nearly so, in public comment.

Please heed the undeviating views of our local officials and residents and utilize our taxpayer money and your human resources for Cal Trans projects elsewhere in District 8.

There may have been some errors or lack of understanding in the comment, but, hopefully, it is representative of general views about the lack of necessity for this project. 


11 June 2026

New City of Chino Hills Statement on CalTrans' Proposed "Improvements" to Carbon Canyon Road

This just in from the City of Chino Hills regarding the proposed "improvements" by CalTrans to Carbon Canyon Road (State Route 142):

 



The City of Chino Hills remains firmly opposed to and is prepared to challenge any decision made by the California Department of Transportation (Caltrans) that would allow large truck traffic to return to State Route 142 (SR-142) and the “S-Curves” on Carbon Canyon Road. Statements made by Caltrans during a June 10 public hearing indicated the agency intends to remove current truck restrictions, regardless of whether roadway safety improvements such as widening of the “S-Curves” are made or not.

For more than seven years, the City worked alongside residents, community members, regional partners, and legislative representatives to address the significant safety concerns posed by large truck traffic of vehicles over four axles along Carbon Canyon Road. Those efforts resulted in truck restrictions that took effect in May 2024, which protect public safety and enhance the quality of life for residents. The City remains committed to ensuring those protections remain in place permanently.

Caltrans is accepting public comments on the project through June 17, 2026. Residents are encouraged to submit comments to be considered as part of the environmental review process by email at D8.1M780.Comments@dot.ca.gov. The City has requested that Caltrans conduct a follow-up public meeting in person to provide additional opportunities for community engagement.

To learn more about about this topic and its history, the June 10 Public Hearing, and how to submit public comments to Caltrans, visit  www.chinohills.org/CarbonCanyon. The City remains committed to advocating for the safety of our community and will continue to provide information related to the project through this website page as it becomes available.

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Carbon Canyon Road S-Curve Zoom Meeting Summary

Last night, CalTrans District 8, which covers the San Bernardino County portion of Carbon Canyon belatedly held a public Zoom meeting to discuss the project to "improve" the S-curves on Carbon Canyon Road, which is California Highway 142, with around 100 concerned residents gathered at the McCoy Equestrian Center Barn for the gathering.  The confab included a relatively brief, pro-forma recitation by CT officials of an overview, background and timeline of the proposed project, which could take up to four years to complete including environmental review, design and construction, while public comment is taking place this month and in July.

As with other projects like this, there are the build and no-build alternatives, but the claim is that the work to widen the S-curves and install retaining walls and other elements is to improve safety, even as the completion of the project would allow more volume because it was made abundantly clear that the ban of trucks of 5 axles or more, implemented a couple of years ago, with several years of concerted action from the cities of Brea and Chino Hills, would almost certainly be rescinded either way, meaning whether the "improvement" was made or not.

Also striking was the reiteration on several occasions by a CT official that this project came about because of public concerns of trucks crossing the centerline striping at the S-curves and so the claim was that this effort to widen the roadway and other aspects was the only real response the agency could make.  The obvious problem with this from the standpoint of those who spoke during the Q&A, considered informal so not recorded for the public record, and the oral comment portion, which was formalized and recorded, is that this was not the reason for the concerns.  

It should be noted that none of the dozens of persons who asked questions or spoke during the meeting, including a former Chino Hills councilmember and mayor, the current mayor and a city official, voiced support for the project.  So, if CT's contentions about concerns from the public were that this project was warranted, why did the public who expressed current concerns agree en masse that this is not what was intended when complaints were registered with the department?

Another remark by a CT official that raised eyebrows was the statement that the project was not intended to add more trucks to traffic on the state highway, but to more broadly improve traffic flow.  As many speakers pointed out, as often as accidents occur at the S-curves—a property owner with expensive cast-iron fencing and walls has, yet again, had these plowed into by a car within the last couple of weeks, and a section at Carriage Hills Lane has been the site of many crashes that have caused power outages throughout the Canyon—the way this section is constructed actually serves to slow most traffic down.  Yet, CT has insisted on adding so many signs, in the belief that this will somehow deter dangerous driving, when only enforcement can mitigate this, that it is almost comical to see how cluttered the roadway has become, yet the behavior continues.

It was also remarked that, while this work may be viewed by the agency as necessary and effective, the isolation of the S-curves from the rest of the state highway seems more than self-defeating.  For example, there are curves in Sleepy Hollow, principally at the east entrance to Rosemary Lane, where trucks routinely cross the centerline and have, in fact, swipes mailboxes and vehicles, while others routinely honk their horns as a warning, but with very limited sight lines.  There is no way to remediate the highway in that location and this is true at another curve to the west under which Carbon Creek passes, while sections in Brea may well involve the same general issues.

Other questions and comments concerned the absolute bare minimum of public notice, the inadequacy of holding a Zoom meeting so that an in-person gathering was requested, the fact that the documents so far prepared were insufficient, the call for a permanent ban on trucks—which CT personnel said would involve the cities going through a similar process to the current one (meaning years of struggle), and more.  One commenters wanted to know who was behind this project in terms of either the complaints registered that led to the interpretation that this work was the best response or who may be lobbying (a common perception is that Amazon, readying to establish a distribution center just outside the canyon on the 142 [the Valencia Avenue portion] in Brea, is behind this) for the work.


Perhaps the most remarkable claim from CT officials was that the ban instituted in the last couple of years was temporary and was always intended to be so.  While City of Chino Hills officials were clear in saying that this was not the case, the response from the department was that it was in the agreement signed by Chino Hills and Brea.  The obvious question is:  what will be the future communications between the municipalities and Cal Trans about this vital issue?

There will, of course, be more to come, but the salient matter right now is for those concerned about this project—and nothing said by CT staff alleviated any concerns, from what this observer heard and saw—this is the time to comment, during this and next month.  There is also the Hope for the Hills campaign against the project

05 June 2026

Chino Hills Historical Society Presentation This Monday: Before Chino Hills State Park

This Monday the 8th at 7 p.m., at the Chino Hills Community Center, 14250 Peyton Drive, across from Ayala High School, the Chino Hills Historical Society hosts a presentation on some history of the area that became Chino Hills State Park, as well as some of the park's history.

If you've been in this amazing local resource and wondered how Rolling M Ranch, the park's headquarters and where there is a great campground, or Telegraph Canyon got their names, you can learn that by attending the talk.

San Bernardino Guardian, 20 September 1873.

If you didn't know that an international airport was proposed for much of the parkland, come on by and hear more about that, as well.

Paul Spitzzeri will discuss some of what the land was used for prior to its preservation and Hills for Everyone President Claire Schlotterbeck, who was deeply involved in the movement for the establishment of the Park, will share some of that story, as well.

Chino Champion, 20 October 1971.

We hope to see you there!

30 May 2026

Carbon Canyon Road S-Curve Widening Zoom Mtg on 10 June

A virtual public meeting set up by CalTrans District 8 for the "State Route 142 S-Curve Project," proposing widening at this section along the summit on Carbon Canyon Road in Chino Hills and which would, many are concerned, allow for the rescinding of the large truck ban just recently enacted, has been scheduled on Zoom for Wednesday, 10 June at 5:30 p.m.

You can request to register by contacting: e&pengagement@icf.com.

For anyone living in Carbon Canyon or who regularly uses the state highway, this is a very important part of public input, so please consider joining and expressing concerns because there is no question that this project will be especially invasive if it involved allowing larger trucks again.  This road should not be used as a large truck route, but one wonders if there is pressure to make it one no matter how detrimental it would be to our communities in Brea and Chino Hills, as well as to the Canyon.

If there is such a plan, what is obviously needed is a coordinated response like Hope for the Hills undertook to fight back against the Southern California Edison TRTP transmission lines some 15 years ago.  That movement was successful and it would take the same type of effort to push back against what might be unreasonable and unwarranted project that serves narrow, though deep pocketed, interests at the expense of broader community concerns.

This post was edited following a comment on the Chronicle Facebook page rightly calling for attention to the facts—we would add, as we know them now, pending further revelations.  In the meantime, the CEQA Initial Study may be worth reviewing before the meeting on the 10th.

And, just found this Chino Valley Champion article, as well, note the statement by a CalTrans spokesperson that the ban may be rescinded once the widening project is complete

24 May 2026

Chino Hills Historical Society Presentation: Before Chino Hills State Park

On Monday, 8 June at 7 p.m. at the Chino Hills Community Center at 14250 Peyton Drive across from Ayala High School, the Chino Hills Historical Society presents a free talk on the some history of the area that became Chino Hills State Park.  

The discussion will include uses of the land by ranchers like Fenton Slaughter, Frank Pellissier and Christopher Hendra and his Rolling M Ranch, while Claire Schlotterbeck, president of Hills for Everyone and a key figure in the preservation of the property in the face of a proposed airport that led to its purchase and creation as a state park, will discuss how that all came together and its ongoing history.

We hope to see you there!