engineering

Second Street Bridge (Allegan, Michigan)

Second Street Bridge (Allegan, Michigan) is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Second Street Bridge (Allegan, Michigan) rather than just read about it. In short: The Second Street Bridge is a one-lane, single-span truss bridge in Allegan, in the U.S. state of Michigan, that carries Second Street over the Kalamazoo River. It is a Michigan State Historic Site, a National Historic Civil Engineering Landmark, and is listed on the National Register of Historic Places.

Key takeaways

Second Street Bridge (Allegan, Michigan) belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Second Street Bridge (Allegan, Michigan) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Second Street Bridge (Allegan, Michigan) from memory before moving on to harder problems.

Reference excerpt

The Second Street Bridge is a one-lane, single-span truss bridge in Allegan, in the U.S. state of Michigan, that carries Second Street over the Kalamazoo River. It is a Michigan State Historic Site, a National Historic Civil Engineering Landmark, and is listed on the National Register of Historic Places. Built in 1886, the bridge replaced an earlier wooden structure. In the early 1980s, the bridge underwent significant renovation.

History Prior to construction of the current structure, the river was spanned by a wooden bridge which had been in use for about fifty years. By the mid-1880s, the bridge had fallen into disrepair. The Allegan Journal and Tribune reported in March 1886 that "The structure miscalled a bridge ... is nearly buried in liquid mud, which serves to cover up some of the holes. We hope steps will be taken to secure an iron bridge before the old one tumbles down." The replacement bridge was designed by Zenas King, founder of the King Iron Bridge Company, and the company began construction in 1886. The bridge was completed in two and a half months owing to fear that the wooden structure might collapse. Construction cost $7,532.25 and the bridge opened to traffic in late September. The bridge was one of the largest built by the company.

In 1979, a structural analysis of the bridge indicated that the wrought iron was in good shape, but the deck was deteriorating. City officials chose to rehabilitate the bridge instead of replacing it because the structure is historic and further study showed that traffic problems would be exacerbated by replacing it with a two-lane structure. Because the bridge was not a critical transportation corridor, the city persuaded the federal government to fund rehabilitation, even though the project would not meet AASHTO standards. The project was approved in part because the bridge was made one-way to overcome the limitations of its narrow roadway. Funding was received in 1981, and the contract was awarded to low bidder H&K Construction for $552,000, compared to an estimated $1.2 million for replacement. For rehabilitation, the 80-ton bridge was rolled ashore on a system of rails, pulled by a hydraulic crane winch. After erecting scaffolding, the bridge was disassembled and members shipped to Holland, Michigan, for repairs and painting. New components were manufactured in Grand Rapids. All components were tested by dye penetration and ultrasound to ensure their soundness. The bridge was then reassembled and rolled back over the river. In June 1983, the bridge's reopening was celebrated by a three-day "Bridgefest". At some point after rehabilitation, traffic lights were installed, permitting the resumption of two-way traffic on the now one-lane bridge. Since 1995, the bridge has featured in the logo of the city of Allegan.

Historic designations

The bridge was listed on the National Register of Historic Places on June 11, 1980. In 1982, the American Society of Civil Engineers designated it as a National Historic Civil Engineering Landmark. On September 8, 1982, the bridge was designated a Michigan State Historic Site and an informational marker was erected in 1984.

Design The Second Street Bridge has a single-span Whipple truss design, made of steel and iron. The bridge is 18 feet (5.5 m) wide and spans 225 feet (69 m) over the Kalamazoo River with 15 to 20 feet (4.6 to 6.1 m) of water clearance. Its abutments are made of granite fieldstone. The structure is decorated with lattice work, iron end post finials, and latticed metal handrails. On one side of the bridge is a pedestrian walkway with wood flooring.

Illustrations

Worked examples

Example 1 — a first encounter with Second Street Bridge (Allegan, Michigan)

Start with the simplest possible case. Write down what Second Street Bridge (Allegan, Michigan) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Second Street Bridge (Allegan, Michigan) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Second Street Bridge (Allegan, Michigan) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Second Street Bridge (Allegan, Michigan)

In research: Second Street Bridge (Allegan, Michigan) appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Second Street Bridge (Allegan, Michigan) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Second Street Bridge (Allegan, Michigan) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1886 establishments in Michigan, Allegan, Michigan, Bridges completed in 1886, so understanding it makes those chapters shorter.
In everyday life: Look for Second Street Bridge (Allegan, Michigan) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Second Street Bridge (Allegan, Michigan) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Second Street Bridge (Allegan, Michigan) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Second Street Bridge (Allegan, Michigan) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Second Street Bridge (Allegan, Michigan) in simple terms?

Why does Second Street Bridge (Allegan, Michigan) matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Second Street Bridge (Allegan, Michigan)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Second Street Bridge (Allegan, Michigan).