New configuration for Baseline

What if? – Baseline and California

How can things be improved? That’s part of the philosophy behind this blog and the Inland Empire offers plenty of opportunity in that department. There is no shortage of places that can be transformed to provide a better experience for all. This is about thinking outside the box and finding solutions to make the area a more inviting place to not just sleep, but also work and play in.

Baseline Road
Basic approximation of the current conditions of Baseline St. looking west. Image by author via Streetmix.

One such opportunity exists in the City of San Bernardino where Baseline Rd., California St., and University Ave. meet. Bordered on the south side by the ball fields/parking lot of Arroyo Valley High School and the north side by more empty lots, there’s really not much going on. This presents the perfect opportunity to upgrade the intersection and improve access to the school for students walking/biking.

But the real benefit will be the improvement of the intersection for traffic flow. Currently, University Ave. is the entrance to AVHS and is located approximately 360′ west of California St. and both intersections are signalized. A significant portion of the students of the school come from the Muscoy area to the north and many arrive by car. As a result, several hundred cars attempt to essentially go straight across between 07:00 and 07:30 every morning. This leads to significant blockage of the road, especially the westbound direction because the left turn phase to turn onto University Ave. from westbound Baseline St. simply can’t be long enough. Additionally, there are also still people attempting to turn left onto California St. from eastbound Baseline, which is a problem since the center turn lane is already full of westbound cars/buses attempting to turn onto University Ave. This charade is repeated in the afternoon, though to a lesser degree.

There might be a tiny bit of relief coming in the next year or two. Many people turning north onto California St. are undoubtedly simply using the neighborhood as a shortcut to access CA-210 at University Ave. Many of these people would likely be able to use Pepper Ave. to get on CA-210 if it were connected. To that end, Rialto and SanBAG are continuing work on extending Pepper Ave. to CA-210 and finish the access ramps. However, there will still be the problem of a significant volume of cars attempting to cross Baseline to access AVHS and there are also a lot of pedestrians.

Roundabout up top.
The upper part of the “roundabout” can feature better bus stops with bike parking and cycletracks. Image by author via Streetmix.

To alleviate the issue of the cross flow of traffic, a grade separation is the best option. That would allow the traffic on Baseline to flow uninterrupted by the crossing of school traffic and vice versa. The idea is conceptually similar to this intersection, where a roundabout situation on top provides access to the crossing road while the main traffic continues straight. This intersection provides the same opportunity and would provide a good option for a bus stop and bike parking as well as a cycletrack. But most importantly, it removes the conflict between the crossing streams of traffic.

Baseline Rd. through lanes
Two through lanes should be enough to handle the relatively low traffic of Baseline Rd. Image by author via Streetmix.

Currently, the center turn lane and two inside lanes are all 14′ wide, which Streetmix doesn’t like at all (see picture above). The proposal would narrow them a foot each and use the extra space for a bollard treatment of some sort instead to remind people to not cross the lines. A single lane would continue straight through the intersection area in each direction below the roundabout. Traffic counts for this exact intersection are proving elusive. However, the intersection with Pepper Ave. in Rialto a little over a mile to the west was seeing a V/C ratio of less than 0.5 in 2010 while the intersection with Mt. Vernon Ave. around a mile east is seeing volumes of ~600 vehicles/hour/direction for peak hour flows which also corresponds to a V/C ratio of less than 0.5 . Consequently, a single lane should be adequate to carry the current traffic on Baseline Rd. and for many years to come, but the space is potentially available to include a second through lane if it’s felt that it would be absolutely necessary.

What makes this project relatively simple might also prove to be the biggest headache. The intersection is on the top of a flood control berm. The grade separation would be accomplished by tunneling through it more than digging down. However, that raises the issue of keeping Lytle  Creek at bay. It certainly isn’t impossible and solutions exist, but the real question is if they’re worth the cost. Although this design means that access to the school wouldn’t be cut off in the event of a flood, but water high enough to threaten the underpass/force its closure means that water in the wash is at a phenomenal level and that it’s impassible.

Still, it would be great to see this project come about. The intersection is not getting any better and signal timing can only go so far. The same goes for widening, though continuing California St. and closing the University Ave. spur could achieve similar goals. Alternatively, the empty lot(s) on the north side of Baseline can be made into a drop off point for Arroyo Valley and the kids can just walk the rest of the way into campus. Something needs to be done soon.

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