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San Antonio Area Freeway System
PROJECT INFO: I-10 from Dominion to Ralph Fair

This page last updated December 4, 2017


Project locationThis project is complete.

Location: I-10 West from Dominion Dr. to Ralph Fair Rd.

Status: Complete

This project will widen the access roads in each direction and convert them to one-way operation.  The existing access road through Leon Springs will remain two-way and a new one-way "bypass" access road will be built from the southern end of Leon Springs to Boerne Stage Rd. in the existing I-10 right-of-way (i.e. behind the elementary school.)  Modifications will be made to all the existing entrance and exit ramps that will straighten and lengthen them and, in a couple of cases, relocate them.  In addition, two new ramps will be added: an EB exit for Dominion and a WB entrance from Dominion.  Boerne Stage Rd. under I-10 and its approaches on either side of I-10 will be widened.  Similarly, the Ralph Fair Rd. overpass and its approaches will also be widened.  New turnarounds will be added WB to EB at Boerne Stage and at Ralph Fair and EB to WB at Dominion.

This project will not make any modifications to the I-10 main lanes.

How this project will help
The intersections of Boerne Stage Rd. and I-10 and Ralph Fair Rd. and I-10 experience recurring congestion daily due to insufficient capacity and bottlenecks caused by obsolete ramp arrangements and the two-way access roads.  Converting the access roads to one-way operation and widening them will significantly increase capacity and improve safety both along their length as well as at their intersections with Boerne Stage and Ralph Fair due to improved signal operations.  The new "bypass" access road on WB I-10 will take traffic destined for Boerne Stage Rd. out of Leon Springs allowing the existing road to be used solely for local traffic and thus remain two-way for the convenience of those motorists.  (The "bypass" access road may be continued northward from Boerne Stage in a future project as warranted.)  The new turnarounds will better facilitate local traffic affected by the one-way access road conversions.  The widening of the Boerne Stage underpass and Ralph Fair overpass will increase capacity at those intersections.  Longer and straighter entrance and exit ramps will improve the safety and efficiency of those maneuvers which should also help to reduce some of the congestion on the I-10 mainlanes in those areas.  Moving the EB entrance from Boerne Stage further downstream will allow it to better capture EB traffic leaving the HEB shopping center.  The new EB exit for Dominion will move through traffic destined for Dominion Dr. or other points south of Boerne Stage to its own exit and the new WB entrance ramp from Dominion will remove that traffic from Leon Springs.  Modeling done on these improvements shows an anticipated 36% reduction in morning peak travel time a whopping 75% reduction in evening peak period travel time.  Research also suggests a 43% reduction in crashes, especially on the access roads.

Construction on the Ralph Fair section of the project (everything north of Boerne Stage Rd.) started in April 2014.  The remainder of the project got underway in April 2015. 

Click on the image below to see an annotated overview schematic of this project.  These plans are courtesy of TxDOT and is subject to change.  Annotations are my own.

 (Note: the schematic is over 2MB in size and may take a few seconds to open.)


Other sites of interest
TxDOT - I-10 (Dominion Drive to Ralph Fair Road - FM 3351)

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