South Carolina Bridge Condition Intelligence

Statewide Overview

SC maintains the 4th-largest state highway system in the nation

Inventoried BridgesNBI · SC

9,504

8,461 state-owned (89%) — SCDOT carries the maintenance burden directly

Good ConditionITEMS 58–60

37.5%

3,568 structures rated ≥ 7 on all condition items

Fair ConditionRATING 5–6

56.1%

5,334 structures — the pipeline that becomes Poor without timely preservation

Poor ConditionRATING ≤ 4

6.3%

602 structures rated ≤ 4 · 540 of them state-owned

Poor Deck Area23 CFR 490

4.42M sq ft

5.6% of all deck area statewide — the federal TAMP penalty metric

Average AgeITEM 27

48yrs

Poor-condition bridges average 65 yrs · 41.6% of inventory pre-dates 1970

All Public Bridges — Condition Split9,504 structures

■ GOOD 37.5%■ FAIR 56.1%■ POOR 6.3%

State-Owned Only — Condition Split8,461 structures · Items 21/22 = 01

■ GOOD 35.7%■ FAIR 57.9%■ POOR 6.4%

Why it matters: an estimated 2,748,245 vehicle crossings occur on Poor-condition bridges every day in South Carolina. With 56.1% of the inventory rated Fair, the state faces a preservation window: every Fair bridge kept out of Poor status avoids replacement costs that typically run 6–10× the cost of preventive treatment.

District & County Drill-Down

7 SCDOT engineering districts · 46 counties

CLICK A DISTRICT TO FILTER · CLICK AGAIN TO CLEAR · SHOWING ALL 46 COUNTIES

Top counties — Poor-condition bridges

County	Dist.	Bridges	Good	Fair	Poor	% Poor	Poor deck sq ft	Avg age
Spartanburg	3	643	334	244	65	10.1%	363,294	45
Greenville	3	636	351	238	47	7.4%	416,893	43
Pickens	3	290	131	124	35	12.1%	85,400	45
Oconee	3	215	68	120	27	12.6%	109,074	54
Horry	5	480	225	231	24	5.0%	162,663	39
York	4	288	120	146	22	7.6%	101,095	41
Orangeburg	7	274	44	208	22	8.0%	54,340	59
Union	4	132	48	63	21	15.9%	111,170	49
Aiken	7	198	64	114	20	10.1%	100,053	48
Chester	4	191	68	103	20	10.5%	107,214	49
Anderson	2	462	129	314	19	4.1%	149,723	54
Cherokee	4	200	90	92	18	9.0%	50,151	40
Richland	1	367	182	168	17	4.6%	122,472	45
Lancaster	4	182	52	113	17	9.3%	41,013	58
Sumter	1	166	67	82	17	10.2%	110,500	44
Dillon	5	129	32	83	14	10.9%	40,804	52
Williamsburg	5	194	77	105	12	6.2%	14,230	48
Laurens	2	254	83	160	11	4.3%	38,946	50
Newberry	2	219	75	133	11	5.0%	79,907	50
Darlington	5	173	55	107	11	6.4%	27,943	51
Florence	5	275	92	173	10	3.6%	149,330	48
Lexington	1	230	110	110	10	4.3%	225,365	44
Marion	5	112	38	64	10	8.9%	63,335	51
Charleston	6	339	141	189	9	2.7%	354,382	36
Allendale	7	69	15	45	9	13.0%	61,429	57
Berkeley	6	217	79	130	8	3.7%	176,740	45
Chesterfield	4	201	75	118	8	4.0%	29,033	50
Fairfield	4	139	49	82	8	5.8%	19,386	49
Kershaw	1	173	66	100	7	4.0%	103,868	47
Clarendon	7	170	31	132	7	4.1%	17,269	49
Georgetown	5	114	39	68	7	6.1%	277,733	47
Marlboro	5	97	35	55	7	7.2%	91,984	54
Bamberg	7	82	10	65	7	8.5%	16,562	54
Colleton	6	231	76	149	6	2.6%	93,801	54
Saluda	2	125	51	69	5	4.0%	84,786	51
Edgefield	2	122	45	72	5	4.1%	11,741	53
Hampton	7	113	18	90	5	4.4%	22,903	53
Dorchester	6	199	57	138	4	2.0%	37,951	53
Abbeville	2	162	67	91	4	2.5%	11,441	50
Beaufort	6	72	28	40	4	5.6%	261,989	36
Greenwood	2	144	32	109	3	2.1%	5,467	54
McCormick	2	68	27	38	3	4.4%	7,816	53
Jasper	6	129	30	97	2	1.6%	2,226	55
Lee	1	91	42	47	2	2.2%	4,539	42
Calhoun	7	61	6	53	2	3.3%	2,311	66
Barnwell	7	76	14	62	0	0.0%	0	59

Predictive Maintenance Priority Queue

100 highest-priority Poor-condition structures

Poor-condition structures ranked by a transparent composite score — condition severity (45%), traffic exposure (30%), age (15%), deck area (10%). In production, this queue would be driven by a trained deterioration model with inspection history, not a static heuristic.

#	Priority▼	Structure / Facility	County (Dist.)	Age	ADT	Deck · Sup · Sub	Min	Deck sq ft
1	77.2	S-9-22 over caw caw creek · Rural Major Collector	Calhoun (7)	90 blt 1935	3,300 9% truck	NNN0	0	1,299
2	74.1	S-38-39 over cooper swamp · Rural Major Collector	Orangeburg (7)	85 blt 1940	1,200 12% truck	NNN0	0	1,455
3	73.1	S-2-145 over trib to horse cr. · Urban Collector	Aiken (7)	71 blt 1954	1,750 4% truck	NNN0	0	788
4	71.0	S-38-191 over roberts swamp · Rural Local	Orangeburg (7)	86 blt 1939	350 8% truck	NNN0	0	515
5	67.0	S-1-159 over johns creek · Rural Local	Abbeville (2)	75 blt 1950	125 5% truck	054	0	412
6	66.2	S-46-59 over little turkey creek · Rural Local	York (4)	44 blt 1981	375 5% truck	000	0	7,164
7	65.0	C-19-234 over br to cedar creek · Rural Local[COUNTY HIGHWAY AGENCY]	Edgefield (2)	56 blt 1969	150 5% truck	003	0	354
8	64.8	S-1426 over long branch · Rural Local[COUNTY HIGHWAY AGENCY]	Orangeburg (7)	49 blt 1976	200 5% truck	440	0	730
9	63.9	S-2-180 over norfolk southern · Urban Local	Aiken (7)	33 blt 1992	300 5% truck	440	0	1,976
10	63.5	C-4-1108 over beaverdam cr. · Rural Local[COUNTY HIGHWAY AGENCY]	Anderson (2)	57 blt 1968	75	000	0	924
11	63.0	SC 70 over roberts swamp · Rural Minor Arterial	Orangeburg (7)	68 blt 1957	3,100 7% truck	NNN1	1	2,254
12	62.2	S-24-285 over rocky creek · Urban Collector	Greenwood (2)	63 blt 1962	2,800 10% truck	414	1	3,309
13	54.7	S-42-52 over motlow creek · Rural Major Collector	Spartanburg (3)	22 blt 2003	1,250 6% truck	NNN1	1	1,529
14	50.5	US 21 over congaree creek · Urban Principal Arterial	Lexington (1)	103 blt 1922	23,200 5% truck	773	3	8,971
15	49.8	CANE GULLY BRANCH- over branch · Rural Local[U.S. FOREST SERVICE]	Berkeley (6)	47 blt 1978	50	771	1	470
16	49.7	S-43-466 over turkey creek · Urban Collector	Sumter (1)	58 blt 1967	2,200 5% truck	552	2	3,624
17	49.4	S-11-59 over thicketty creek · Rural Minor Collector	Cherokee (4)	78 blt 1947	750 5% truck	225	2	578
18	48.4	SC 9 BUS over crooked creek · Urban Minor Arterial	Marlboro (5)	104 blt 1921	10,100 3% truck	633	3	5,429
19	47.8	US 521 SB over rr csxt · Rural Principal Arterial	Lancaster (4)	96 blt 1929	12,150 6% truck	633	3	5,121
20	47.6	US 701 over maple swamp · Rural Minor Arterial	Horry (5)	94 blt 1931	14,100 11% truck	NNN3	3	1,705
21	47.2	S-8-62 over i-26 · Urban Minor Arterial	Berkeley (6)	64 blt 1961	39,100 3% truck	635	3	26,059
22	46.3	SC 72 over south fork creek · Rural Principal Arterial	Chester (4)	96 blt 1929	6,100 5% truck	434	3	11,044
23	46.3	C-36-1033 over scotts creek · Urban Local[CITY/MUNICIPAL AGENCY]	Newberry (2)	85 blt 1940	150 5% truck	652	2	646
24	46.0	US 176 over ns rr · Urban Minor Arterial	Spartanburg (3)	71 blt 1954	19,500 5% truck	563	3	12,615
25	45.9	S-11-106 over br of suck ck · Rural Major Collector	Cherokee (4)	70 blt 1955	275 9% truck	245	2	852
26	45.6	US 76 over us 601 · Rural Principal Arterial	Richland (1)	68 blt 1957	19,100 7% truck	536	3	11,937
27	45.5	S-38-77 over little limestone creek · Rural Minor Collector	Orangeburg (7)	69 blt 1956	250 10% truck	552	2	1,088
28	45.5	S-39-277 over twelve mile creek · Rural Local	Pickens (3)	61 blt 1964	350 5% truck	426	2	3,449
29	44.8	S-29-765 over hanging rock creek · Rural Local	Lancaster (4)	67 blt 1958	200 5% truck	224	2	2,418
30	44.4	US 76 over catfish branch · Urban Principal Arterial	Marion (5)	84 blt 1941	5,900 6% truck	543	3	5,668
31	43.3	US 278/GRAYS HWY over bay swamp · Rural Minor Arterial	Jasper (6)	93 blt 1932	2,700 9% truck	NNN3	3	987
32	43.1	S-42-31 over peters creek · Urban Minor Arterial	Spartanburg (3)	62 blt 1963	11,000 2% truck	553	3	6,100
33	43.0	C-30-532 over south rabon creek · Rural Local[COUNTY HIGHWAY AGENCY]	Laurens (2)	54 blt 1971	200 5% truck	662	2	991
34	42.2	SC 39 over s. edisto river swamp · Rural Minor Arterial	Orangeburg (7)	85 blt 1940	2,200 16% truck	553	3	6,907
35	41.3	SC 49/SC 215 CON over southern railroad · Urban Collector	Union (4)	95 blt 1930	1,000 5% truck	535	3	2,479
36	40.7	S-42-242 over i-85 · Urban Minor Arterial	Spartanburg (3)	66 blt 1959	3,300 10% truck	636	3	6,823
37	40.1	S-23-447 over brushy creek · Urban Collector	Greenville (3)	44 blt 1981	9,100 2% truck	773	3	3,038
38	39.5	SC 7 over ashley river · Urban Principal Arterial	Charleston (6)	72 blt 1953	47,800 4% truck	456	4	165,361
39	39.4	US 29 over enoree river · Urban Principal Arterial	Greenville (3)	86 blt 1939	47,300 5% truck	654	4	30,808
40	39.2	US 276 over p and n rr. · Urban Principal Arterial	Greenville (3)	91 blt 1934	41,300 3% truck	446	4	10,725
41	39.2	US 701 over crabtree swamp · Urban Minor Arterial	Horry (5)	105 blt 1920	23,000 4% truck	NNN4	4	3,481
42	39.1	SC 83 over little pee dee river · Rural Major Collector	Marlboro (5)	88 blt 1937	550 10% truck	534	3	6,423
43	39.1	US 29 over mountain creek · Urban Principal Arterial	Greenville (3)	86 blt 1939	47,300 5% truck	745	4	18,861
44	38.9	S-42-317 over frey creek · Urban Local	Spartanburg (3)	100 blt 1925	300 5% truck	533	3	2,217
45	38.9	I-26 over rr csxt · Urban Interstate	Charleston (6)	62 blt 1963	94,100 4% truck	546	4	77,972
46	38.6	S-39-56 over mid br of bushy cr · Urban Local	Pickens (3)	58 blt 1967	2,500 5% truck	773	3	1,239
47	38.6	S-42-967 over fair forest creek · Urban Local	Spartanburg (3)	44 blt 1981	5,100 5% truck	773	3	1,989
48	38.2	SC 8 over rices creek · Urban Minor Arterial	Pickens (3)	105 blt 1920	14,600 3% truck	654	4	6,533
49	38.1	US 52/US 17 ALT over cooper river · Rural Principal Arterial	Berkeley (6)	81 blt 1944	29,000 5% truck	554	4	58,562
50	38.1	US 501 BYP over waccamaw river · Urban Principal Arterial	Horry (5)	67 blt 1958	56,800 6% truck	444	4	69,187
51	38.1	S-29-26 over horton creek · Rural Major Collector	Lancaster (4)	64 blt 1961	1,450 7% truck	334	3	2,095
52	38.0	I-85 over trib laurel crk · Urban Interstate	Greenville (3)	65 blt 1960	113,800 20% truck	NNN4	4	3,758
53	37.6	SC 703 over shem creek · Urban Principal Arterial	Charleston (6)	78 blt 1947	37,500 2% truck	554	4	21,259
54	37.6	US 321 over crane creek · Urban Minor Arterial	Richland (1)	98 blt 1927	14,900 6% truck	664	4	11,761
55	37.6	US 501 BYP over u.s.701 · Urban Principal Arterial	Horry (5)	67 blt 1958	56,800 6% truck	445	4	38,585
56	37.5	S-11-195 over cherokee creek · Urban Collector	Cherokee (4)	74 blt 1951	700 6% truck	435	3	1,037
57	37.3	US 52 over jefferies creek · Urban Principal Arterial	Florence (5)	87 blt 1938	24,100 2% truck	774	4	10,731
58	37.2	SC 417 over us 276 nb & c. p. rr · Urban Minor Arterial	Greenville (3)	95 blt 1930	14,900 3% truck	554	4	10,913
59	37.1	US 76 over rr csxt · Urban Minor Arterial	Richland (1)	86 blt 1939	21,600 3% truck	745	4	16,760
60	37.1	US 29 over c-23-75/60736071 · Urban Principal Arterial	Greenville (3)	65 blt 1960	37,200 4% truck	465	4	91,435
61	37.0	US 278 EB over mackay creek · Urban Principal Arterial	Beaufort (6)	69 blt 1956	28,950 4% truck	644	4	87,808
62	36.9	US 701 over bear swamp · Urban Minor Arterial	Horry (5)	94 blt 1931	17,400 7% truck	NNN4	4	1,650
63	36.9	US 17 NB over ashley river · Urban Principal Arterial	Charleston (6)	64 blt 1961	38,250 2% truck	654	4	77,190
64	36.8	US 501 over crabtree swamp · Urban Principal Arterial	Horry (5)	77 blt 1948	38,600 5% truck	NNN4	4	3,007
65	36.8	S-2-22 over south edisto river #1 · Rural Major Collector	Aiken (7)	72 blt 1953	550 11% truck	443	3	3,585
66	36.7	S-23-40 over south saluda riv · Rural Major Collector	Greenville (3)	68 blt 1957	650 11% truck	335	3	3,112
67	36.4	SC 9 over ropers mill branch · Rural Minor Arterial	Dillon (5)	105 blt 1920	8,300 7% truck	647	4	918
68	36.3	S-33-117 over long cane creek · Rural Local	McCormick (2)	93 blt 1932	150 5% truck	737	3	3,268
69	36.3	US 76 EB over broadway creek · Urban Principal Arterial	Anderson (2)	105 blt 1920	7,000 5% truck	545	4	4,020
70	36.3	S-26-99 over palmetto swamp · Rural Major Collector	Horry (5)	65 blt 1960	700 9% truck	773	3	1,239
71	36.3	US 17 over waccamaw river · Rural Principal Arterial	Georgetown (5)	59 blt 1966	25,600 6% truck	664	4	173,087
72	36.1	SC 421 over little horse creek · Urban Minor Arterial	Aiken (7)	99 blt 1926	9,000 4% truck	544	4	3,794
73	36.1	S-42-108 over richland creek · Rural Major Collector	Spartanburg (3)	66 blt 1959	600 6% truck	663	3	1,239
74	36.0	US 76 over middle swamp · Urban Principal Arterial	Florence (5)	88 blt 1937	14,000 11% truck	544	4	7,500
75	36.0	S-37-59 over trib to cane creek · Rural Major Collector	Oconee (3)	74 blt 1951	375 4% truck	553	3	1,536
76	35.9	US 501 over chinners swamp · Rural Principal Arterial	Horry (5)	77 blt 1948	25,600 8% truck	NNN4	4	5,359
77	35.9	US 221 over csxt rr · Rural Minor Arterial	Spartanburg (3)	76 blt 1949	24,000 7% truck	645	4	11,746
78	35.9	S-42-184 over jamison creek · Rural Major Collector	Spartanburg (3)	70 blt 1955	450 6% truck	553	3	1,788
79	35.8	US 501 over brunson creek · Rural Principal Arterial	Horry (5)	77 blt 1948	25,600 8% truck	NNN4	4	3,158
80	35.8	US 17 over edisto river · Rural Principal Arterial	Colleton (6)	72 blt 1953	19,300 12% truck	445	4	51,321
81	35.7	US 29 over cherokee creek · Rural Principal Arterial	Cherokee (4)	94 blt 1931	8,900 7% truck	554	4	8,434
82	35.7	US 29 over ns · Urban Principal Arterial	Spartanburg (3)	86 blt 1939	12,200 5% truck	646	4	17,230
83	35.7	I-26 over cannons creek · Rural Interstate	Newberry (2)	65 blt 1960	42,700 18% truck	NNN4	4	6,563
84	35.6	US 15 over panther creek · Rural Minor Arterial	Marlboro (5)	100 blt 1925	7,600 8% truck	NNN4	4	1,399
85	35.5	C-42-787 over csxt rr · Urban Collector[CITY/MUNICIPAL AGENCY]	Spartanburg (3)	112 blt 1913	3,500 2% truck	444	4	4,084
86	35.5	S-23-318 over dam at lake lanier · Rural Local	Greenville (3)	100 blt 1925	75	443	3	2,721
87	35.5	US 76 over norfolk southern rr · Rural Principal Arterial	Anderson (2)	96 blt 1929	7,900 6% truck	544	4	5,446
88	35.5	US 15 SB over pocotaligo river · Urban Principal Arterial	Sumter (1)	90 blt 1935	10,600 7% truck	644	4	7,952
89	35.5	US 276 over north saluda river · Urban Minor Arterial	Greenville (3)	85 blt 1940	12,800 3% truck	745	4	9,986
90	35.4	US 29 over southern railroad · Rural Principal Arterial	Cherokee (4)	97 blt 1928	7,600 11% truck	445	4	4,037
91	35.3	US 29 over little thicketty creek · Rural Principal Arterial	Cherokee (4)	96 blt 1929	7,000 6% truck	554	4	7,231
92	35.3	SC 9 over sc 85 · Urban Minor Arterial	Spartanburg (3)	67 blt 1958	27,100 2% truck	446	4	18,733
93	35.3	I-95 NB over great pee dee river · Rural Interstate	Florence (5)	58 blt 1967	23,150 23% truck	654	4	111,962
94	35.2	SC 9 over phillis creek · Rural Principal Arterial	Marlboro (5)	93 blt 1932	8,300 15% truck	NNN4	4	5,373
95	35.2	SC 124 over saluda river · Urban Minor Arterial	Greenville (3)	85 blt 1940	11,600 7% truck	544	4	9,445
96	35.2	US 29 over reedy river · Urban Principal Arterial	Greenville (3)	66 blt 1959	30,500 4% truck	664	4	12,502
97	35.1	I-85 SBL over seneca river · Rural Interstate	Anderson (2)	62 blt 1963	24,850 25% truck	646	4	50,081
98	35.1	SC 12 over congaree river · Urban Freeway/Expressway	Lexington (1)	49 blt 1976	24,500 4% truck	546	4	188,175
99	35.0	S-11-49 over cherokee creek · Rural Local	Cherokee (4)	67 blt 1958	350 5% truck	333	3	2,095
100	35.0	US 123 over l-3199/reedy river · Urban Principal Arterial	Greenville (3)	57 blt 1968	30,600 9% truck	455	4	50,031

SHOWING 100 OF 100 · CLICK COLUMN HEADERS TO SORT · CONDITION CHIPS: DECK (ITEM 58) · SUPERSTRUCTURE (59) · SUBSTRUCTURE (60) · CULVERT (62) WHERE APPLICABLE

Age & Risk Profile

NBI Item 27 (year built) · Item 29 (ADT)

Bridges by decade built × current conditionITEM 27

The 1950s–1960s construction cohort — Interstate-era structures now 60–75 years old — carries the largest share of Fair and Poor ratings. 41.6% of the inventory pre-dates 1970, defining the replacement wave a deterioration model must sequence.

Traffic exposure × lowest condition ratingITEMS 29 · 58–62

133 STRUCTURESsit in the shaded quadrant — rated Poor and carrying ≥ 5,000 vehicles/day. These combine the highest structural risk with the highest public exposure; a risk-weighted program addresses them first. Poor bridges shown in red; Good/Fair sampled 1-in-3 in gray. Integer ratings are jittered vertically for legibility.

From Inventory to Intelligence

Roadmap use cases this data foundation enables

5.1

Predictive Maintenance Modeling

Every chart above runs on a single year of NBI data. Joining the 30+ year NBI archive with SCDOT inspection records, work-order history, and traffic data yields per-structure deterioration curves — models that forecast when each Fair bridge slips to Poor, so crews are dispatched by predicted risk instead of inspection cadence alone.

InputsNBI archive · BrM/AASHTOWare inspections · maintenance work orders · WIM/traffic

OutcomeTreatment timed at 1/6th–1/10th the cost of replacement

5.2

Investment Prioritization

The priority queue in Section 03 is a static heuristic; the production version becomes an optimization layer over the capital program. Given a budget scenario, it selects the portfolio of preservation, rehab, and replacement projects that maximizes deck-area health per dollar — and shows the legislature exactly what each funding level buys.

InputsDeterioration model · unit-cost library · STIP/Act 98 funding scenarios

OutcomeDefensible, repeatable capital programming across 7 districts

5.3

Federal Compliance & Performance Reporting

FHWA measures states on the percentage of NHS deck area in Good and Poor condition (23 CFR 490), with penalty provisions when Poor exceeds 10%. An automated pipeline from inspection data to TAMP targets and biennial performance reports replaces spreadsheet assembly — and flags trajectory risk quarters before a threshold is crossed.

InputsNBI submission pipeline · TAMP targets · HPMS pavement data

OutcomeContinuous compliance posture, not an annual scramble

5.4

The Enterprise Data Foundation

None of the above requires new data collection — this demonstration was built entirely from data SCDOT already reports to FHWA. The roadmap engagement inventories these existing assets, designs the governance and platform layer that connects them, and sequences AI use cases by value and readiness. Bridges are one lane; the same pattern serves pavement, safety, and project delivery.

InputsData inventory · governance model · platform architecture

OutcomeA prioritized, fundable AI roadmap grounded in real assets