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U.S. Route 1 south - Pennsylvania line to Baltimore
U.S. Route 1 leaves behind the Commonwealth of Pennsylvania at the Mason-Dixon Line and enters Maryland as a two-lane road, the Rising Sun Bypass. (10-9-2025)
The highway immediately comes upon a crossroads with Greenmount Road. (10-9-2025)
US 1 is currently in Cecil County, the first of six it passes through during its 81-mile course in Maryland. (10-9-2025)
Heading into trees, the route approaches an intersection with Little New York Road. (10-9-2025)
Next, the highway intersects Stevens Road. (10-9-2025)
Stevens Road passes just to the east of Rising Sun. (10-9-2025)
Soon, US 1 comes upon a traffic signal. (10-9-2025)
Intersected at the signal are Mount Street, which heads south into Rising Sun, and Red Pump Road. (10-9-2025)
Red Pump Road (right) leads north toward the Horseshoe Boy Scout Reservation in West Nottingham Township, PA. (10-9-2025)
A State Highway Administration variable message sign (VMS) follows the signal. (10-9-2025)
Rising Sun's Plumpton Park Zoo can be accessed by turning left up ahead. (10-9-2025)
A truck route bypassing MD 222 and the riverside town of Port Deposit joins southbound US 1 up ahead. (10-9-2025)
Interests to Lancaster, PA are to keep straight up ahead, while turning left once again leads toward downtown Rising Sun. The right leg of the intersection is Slicers Mill Road. (10-9-2025)
A newly-erected traffic signal, not yet activated when these photos were taken, sits at the intersection. (10-9-2025)
Turning left up ahead puts one onto southbound Maryland Route 276 (Jacob Tome Memorial Highway). (10-9-2025)
Truck traffic going south on MD 276 is diverted after a few miles onto MD 275 to reach I-95 and US 40, avoiding a steep descent faced by MD 276 into Port Deposit. (10-9-2025)
US 1 reassurance follows MD 276. (10-9-2025)
Bel Air, the seat of neighboring Harford County, is 26 miles away, and Lancaster is 38 miles' drive to the north via US 222. (10-9-2025)
US 1 is now about to receive the western end of Maryland Route 273 (Rising Sun Road). (10-9-2025)
The speed limit drops from 50 to 40 at the MD 273 junction. Traffic coming from MD 273 west must take a 90-degree right turn to reach US 1. In turn, getting from US 1 south to MD 273 east requires making a left turn up ahead and then turning left again in a matter of a few feet. (10-9-2025)
To the left, eastbound MD 273 begins as a one-lane ramp that soon joins MD 273 west. (10-9-2025)
The speed limit is now 40 MPH, and US 1 becomes known as Conowingo Road (a name it will carry for the next 20 miles or so), with all access controls gone for the time being. (10-9-2025)
Horse Shoe Road is intersected up ahead after the route goes uphill. (10-9-2025)
Spready Oak Road is then intersected twice beside the Spready Oak Country Cafe. (10-9-2025)
Intersected at left, Love Run leads out to Colora Road which can be taken to the namesake community of Colora. (10-9-2025)
At another fork in the road soon afterward, and within a wide curve to the right, US 1 intersects Porters Bridge Road (Maryland Route 591B), the eastern segment of an old alignment of US 1 that crossed Octoraro Creek on two separate truss bridges, one built in 1858 and the other in 1885 after the original was washed out. (10-9-2025)
After completing the curve, US 1 begins its descent into the Octoraro valley. (10-9-2025)
While going downhill, the highway curves left and intersects Westwood Drive. (10-9-2025)
At the bottom of the hill, US 1 crosses the Octoraro by way of this 1933-built bridge, which replaced the 1885 bridge downstream when US 1 bypassed it. (10-9-2025)
After passing the Octoraro Park mobile home community beside the creek, US 1 starts going back uphill. (10-9-2025)
The route will soon intersect Connelly Road. (10-9-2025)
A route marker to the right tells truckers who got off I-95 or US 40 at Perryville that US 222 toward Pennsylvania can be reached by continuing straight at the intersection ahead. Southbound, it is I-95 and US 40 that are marked straight ahead. (10-9-2025)
Even though it is marked as a traditional crossroads, there is a fork in the road to the left where Colora Road (the other segment of MD 591, officially MD 591A) intersects US 1 at about a 30 to 45-degree angle. This piece of Colora Road dead-ends at the Octoraro Creek due to the closure and eventual demolition of Porter's Bridge. Connelly Road ends here despite what the previous sign implies. (10-9-2025)
Another VMS is situated along the right side of the highway as US 1 ascends out of the valley. (10-9-2025)
The route intersects Merry Knoll Lane up ahead. (10-9-2025)
Afterward, beside the Spring Valley Farm, the highway curves left. (10-9-2025)
Soon, US 1 comes upon its junction with US 222, signaling its entry into Conowingo. (10-9-2025)
Bel Air and Lancaster are respectively marked straight and right at the intersection. (10-9-2025)
US 222 goes 95 miles northeast to Allentown, PA by way of Lancaster and Reading. It now ends here, but until 1995 it continued south to Perryville via Port Deposit. When US 222 was truncated to Conowingo, MD 222, previously a stub between Broad Street (MD 7B) and US 40 in Perryville, was extended along US 222's former routing south of Conowingo. (10-9-2025)
At left, Rowlandsville Road leads south out of Conowingo to a meeting with Moore Road and Doctor Jack Road beside the Octoraro. (10-9-2025)
After US 222, US 1 curves to the left. (10-9-2025)
Barrett Road is subsequently intersected at left. (10-9-2025)
The current speed limit is 40 MPH with a truck speed of 35. (10-9-2025)
The no trucks on MD 222 rule is reiterated by a sign ahead on the right. (10-9-2025)
US 1 curves left as it starts its descent toward the Susquehanna River. (10-9-2025)
Interests to Susquehanna State Park across the river are to keep straight on US 1, while Port Deposit is a few miles' drive south on MD 222 to the left. (10-9-2025)
Motorists are warned to watch for ice in this area in the winter. (10-9-2025)
A flashing beacon at the MD 222 intersection up ahead was replaced with a full traffic signal in 2021. (10-9-2025)
After curving right, US 1 begins crossing the Susquehanna along the Conowingo Dam. (10-9-2025)
The Conowingo Dam, which includes a hydroelectric power plant, is 10 miles upstream of the mouth of the Susquehanna at the top of the Chesapeake Bay between Havre de Grace and Perryville. (10-9-2025)
The south/west end of the dam is just past the power station seen at left. (10-9-2025)
Once over the Susquehanna, US 1 is in Harford County. (10-9-2025)
Parking for the Conowingo Visitor Center and Conowingo Swimming Pool are to the left. The Peach Bottom nuclear power plant, another facility of Conowingo Hydroelectric's owner Constellation Energy, is several miles to the north of here in Peach Bottom Township, PA. (10-9-2025)
After intersecting Shuresville Road, US 1 has two slight curves before beginning to go downhill. (10-9-2025)
The highway subsequently has a steep climb back uphill. (10-9-2025)
The route's right lane ends at the top of the hill. (10-9-2025)
A weigh station for large trucks is half a mile away. (10-9-2025)
After it goes uphill again, US 1 approaches its junction with Maryland Route 623 (Castleton Road). (10-9-2025)
Susquehanna State Park can be reached by turning left at the signal. (10-9-2025)
The historic area of Havre de Grace is also to the south. (10-9-2025)
Although it runs north-south, MD 623 is signed east-west. It ends a quarter-mile to the south of here at MD 161, while in the other direction, it heads toward Pennsylvania. (10-9-2025)
A US 1 reassurance shield follows MD 623. (10-9-2025)
The route then comes upon the northern terminus of Maryland Route 161. (10-9-2025)
MD 161 (Darlington Road) heads south through downtown Darlington and west of Susquehanna State Park, ending up at Maryland Route 155 at the village of Level. (10-9-2025)
After MD 161, beside Emma Rockey Park, US 1 curves right. A curve to the left soon afterward orients US 1 due east-west. (10-9-2025)
The route encounters a few cluster of trees over the next couple of miles, but otherwise the land is open. (10-9-2025)
Up ahead, Berkley Road leads north back to MD 623, then to Glen Cove Road at the mouth of Peddler Run, which the Mason-Dixon Trail cuts through. (10-9-2025)
The next turn is at Smith Road. (10-9-2025)
After that is an intersection with Cedar Church Road, seen at left. (10-9-2025)
US 1 is now approaching Maryland Route 440. (10-9-2025)
A wide curve to the left precedes MD 440. (10-9-2025)
MD 440 (Dublin Road) goes west to Dublin at a crossroads with MD 136, and out to MD 543 at the hamlet of Ady. (10-9-2025)
Afterward, US 1 intersects Center Street within an S-curve. (10-9-2025)
The area of Hickory is 8 miles southwest of this point. (10-9-2025)
Another wide curve to the left is impending. (10-9-2025)
Hughes Road is intersected on the other side of the curve. (10-9-2025)
The route then straightens out for a few tenths of a mile. (10-9-2025)
US 1 then encounters the north end of Arena Road. (10-9-2025)
A crossroads with Poole Road, which runs northwest to the subdivision of Dublin Manor and in the other direction to Trappe Church Road, follows soon thereafter. (10-9-2025)
Soon, US 1 nears a signalized intersection with Maryland Route 136 (Priestford Road). (10-9-2025)
MD 136 runs 30 miles southeast-northwest from MD 7 just west of Belcamp-Riverside to MD 23 in Norrisville, all in Harford County, by way of Creswell, Churchville, Dublin and Whiteford. (10-9-2025)