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B&O Old Main Line Bridges B&O Old Main Line Bridges
Baltimore to Point of Rocks

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Below is a list of bridges along the B&O (now CSX) Old Main Line in Maryland. Construction dates are approximate. Some bridges have their number painted on (designated by italics below); numbers for the remaining bridges are extrapolated.

Investigating the numbering of the bridges has been a pet project. I find the topic interesting because the numbering may shed light on the construction type or date. It also helps reveal the location of bridges I've missed seeing.

The OML's bridge numbering counts outward from Baltimore. The bridges are numbered consecutively (not mileage based), and some bridge numbers have letters suffixed. Some suffixes indicate bridges built after the OML had been initially constructed. To my surprise, non-RR bridges, such as those that carry Interstate highways over the tracks, are also numbered. My numbering scheme ignores those, especially since such roads obviously didn't exist when the OML was built circa 1830.

In many cases, roadway maps from the B&O Railroad Historical Society and I disagree on the numbers, mostly because their roadway maps (RM# column in the table) omit bridges or have them out of order.

Any comments? EMail me.

+ = newest additions to list

# RM # NAME / NEAR STYLE BUILT ADC MAP
1 Ostend Street * concrete / steel filled ~1980 Ba 42 J 1
2 Carey Street * stone / steel 18xx, 1924 Ba 42 J 1
3B Gwynn's Run stone arch 1829, 1848 Ba 42 G 2
4? Carrollton Viaduct 2 stone arches 1829 Ba 42 F 3
4B Western MD line concrete / steel 1900 est. Ba 42 F 3
5 + Jackson's Bridge site wood 1829, replaced ~1870, no known photos Ba 42 F 4
4A Patapsco Ave. * concrete / steel 1964 Ba 42 E 6
5A Hammonds Ferry Road * concrete / steel 1964 Ba 42 E 7
5B Lansdowne Blvd. * DH concrete / steel 1964 Ba 42 E 7
walkway * cinder block 1967, closed 2011 Ba 42 E 8
6A Roberts Run * DH stone arch, widened concrete 1829, 1931 Ba 42 D 9
7A Baltimore Beltway * DH box plate, 2 spans 1960 est. Ba 42 D 9
7 + Halethorpe Farms Rd BS stone arch, buried? 1829 Ba 42 A 11
8A 8A Halethorpe Farms Rd * concrete / steel 1950 Ba 42 A 11
8B Gadsby's Run stone arch, extended 1828, 1874, 1930? Ba 42 A 11
8C 8C PA RR (Amtrak) * DH concrete / steel 1870, 1934 Ba 42 A 11
8D Washington Blvd., US 1 * concrete / steel 1929 Ba 41 K 11
8 St. Denis stone arch 1830 Ba 41 J 12
9AA I-195 * concrete / steel ~1970 Ba 41 J 12
9B Rolling Road * concrete / steel 1930 Ba 41 J 12
9C I-95 * concrete / steel ~1970 Ba 41 G 12
9 Soapstone Branch stone / concrete arch 1830, redone later Ba 41 E 11
10 Avalon stone arch 1830 Ba 41 D 10
11 Orange Grove East stone / concrete arch 1830 Ba 41 C 10
12 Orange Grove West stone arch 1830, 1869 Ba 41 B 8
13 Patterson Viaduct 4 stone arches, 1 survives 1828, disused Ho 13 B 13
13A 13A Ilchester * steel 1903 Ba 40 K 6
14 Lees stone arch 1830, disused Ho 12 J 11
14A Lees brick arch, adjacent 1903 Ho 12 J 11
? 14 1/2 To Flour Mill Steel ~1900 Ho 12 G 10
15 15 Oliver Viaduct 3 stone arches (now 1 & steel) 1829, 1900, 1931 Ho 12 G 9
16 Sucker Branch stone arch 1830 Ho 12 G 8
I-70 steel/concrete ~1970 Ho 12 G 3
17 Lower Elysville stone / wood, later Bollman 1838, 1856, disused Ho 12 D 1
17A 17A Daniels steel, 4 spans 1905 Ho 12 D 1
18 Upper Elysville stone / wood, later Bollman 1838, 1852, disused Ho 12 C 1
18A 18A Brice Run concrete / steel, 2 spans 1905 Ba 32 A 8
18 1/2 abandoned stone arch 1830, disused Ho 12 A 1
19 abandoned brick arch 1830, 1868?, disused Ho 12 A 1
19A 19A Eureka stone / steel, 3 spans 1906 Ho 6 K 13
20 Line Run stone arch 1838, disused Ho 6 K 13
20A Line Run stone arch 1904 Ho 6 K 13
21 22 Davis Branch stone arch, bracing, concrete 1830, 1980? Ho 6 H 13
22 22 1/2 Woodstock 1 stone arch 1830 Ho 6 E 11
22 1/2 23 Woodstock 2 stone arch 1830 Ho 6 D 9
23 Woodstock 3 * DH stone arch 1905? Ho 6 C 8
24 Marriottsville * stone / steel / concrete 1830, 1930? Ho 6 A 7
25 Marriottsville * stone arch 1830, washed out Ca 35 K 6
26 26 Henryton concrete / steel, 3 spans 1849 (Bollman), 1902 Ca 35 K 6
26A 26 1/2 East Gorsuch stone, rails, steel, concrete 1830, rebuilt ~1900 Ca 35 G 5
27 Gorsuch concrete 1830, ~1910 Ca 35 E 5
27 1/16 Freedom Water Treatment * 2 steel pipes / concrete 1975 Ca 35 D 4
27 1/8 MD 32 * steel / concrete 1973, 2003 Ca 35 A 4
27A 27A Sykesville East * stone / steel 1903 Ho 4 J 5
27B 27B Sykesville West * stone / steel 1903 Ho 4 J 5
27C 28 Piney Branch * stone / steel / wood 1830, 1903 Ca 34 G 5
28 New Port * stone block 1830 Ca 33 G 4
28A Gillis Falls concrete 1830, 1868 (Bollman), 1903 Ca 33 G 4
29 orig Mt. Airy Loop stone 1839, crumbling Ca 32 H 3
29 Patapsco River, Loop stone brick arch 1901, disused Ho 2 H 5
29A 29A Watersville stone / steel 1901 Ho 3 B 4
29B 29B Twin Arch * 2 stone arches 1901 Ca 32 F 5
29C 29C mile 39 * stone arch 1901 Ca 32 D 4
30 orig orig Twin Arch 2 stone arches (now 1) 1831, crumbling Ca 32 D 4
31 orig Bush Creek, Loop stone arch, concrete 1831, 1839, 1901 Fr 41 K 2
29E Bush Creek, Cutoff stone arch 1900 Fr 41 K 2
29 3/4 I-70 * concrete / steel 1973 Fr 41 G 2
30 30 Bill Moxley Road * concrete / steel 1973 Fr 41 G 2
30A mile 42 stone arch 1901 Fr 41 G 2
30B lengthening of 30A * concrete arch 1973 Fr 41 G 2
30C Woodville Road stone arch 1901 Fr 41 F 1
30 1/2C Bartholow Road * concrete / steel 1973 Fr 41 D 1
31 Lynn Burke Road stone arch 1901 Fr 32 B 13
32 orig site of orig ROW * stone arch? 1831, removed by I-70 Fr 31 K 12
32 Bush Creek stone arch 1902 Fr 31 K 13
33 orig Monrovia DH stone arch 1831, disused Fr 40 G 1
32A Monrovia DH stone, brick arch 1902 Fr 40 G 1
32B 32B Green Valley Road stone / steel / concrete 1902 Fr 40 F 1
? 32 1/4 West Monrovia stone / concrete (arch removed) 1831, 1902 Fr 40 D 1
33A 33A Dennis * stone / steel 1903 Fr 39 G 2
33B 33B East Hartman stone / steel 1903 Fr 39 F 2
33C West Hartman * stone / steel / concrete 1903 Fr 39 E 2
34 orig abandoned Bush Creek * stone 1838?, disused Fr 39 F 2
34 34 Riverwood 1 * stone / steel 1903, 1927 Fr 39 E 3
34 1/4 34 1/4 Riverwood 2 * stone / steel 1903, 1927 Fr 39 D 3
34 1/2 34 1/2 Riverwood 3 * stone / steel 1903, 1927 Fr 39 D 4
35 35 Monocacy River stone / steel 1831, 1854, 1863, 1890, 1908, 1927 Fr 38 J 1
35A MD 355 concrete / steel ~1930 Fr 38 J 1
35B I-270 * DH steel / concrete ~1960 Fr 38 G 1
36 Ballenger Creek DH concrete arch 1832, ~1930 Fr 38 F 2
Buckeystown * DH stone arch 1832 Fr 37 K 8
Adamstown DH stone arch 1832 Fr 37 F 12
36A 36A Tuscarora Creek * DH stone arch 1832 Fr 37 E 13
? Adamstown Cutoff stone / brick arch 1902, disused Fr 44 D 3
36B Doubs Branch * DH steel / concrete 1832, ~1930 Fr 37 D 13
36C Tuscarora Cr tributary DH stone arch 1832, 1871 Fr 44 B 1

* Bonus picture (i.e. not shown in OML virtual tour).
DH = picture courtesy Dave Hiteshew
BS = picture courtesy The Baltimore Sun
Also see the OML Tunnels list
Bridge Basics (nice description of bridge designs)
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